- The same concept or a question is asked with different angles to clear Doubts.
- Topic Specific, with a mix of easy, medium, and high-level questions for strong subject clarity .
📘 Welcome
Hi User, you have selected Read Mode.
This is Time Free Mode for your convenience to understand every question as per your Ease and Time.
Here You get Answer and Details button. After mastering this mode, you can go for a test with Test Mode on the main page designed especially with Exam Features.
This is Time Free Mode for your convenience to understand every question as per your Ease and Time.
Here You get Answer and Details button. After mastering this mode, you can go for a test with Test Mode on the main page designed especially with Exam Features.
Q1. In a sound wave graph, compressions are represented by
In a sound wave graph (pressure vs. position or time), compressions correspond to the upper portions or peaks of the graph. This is because compression is a region of high pressure, and on a graph, high pressure is shown as upward peaks. Rarefactions (low pressure) correspond to lower portions or troughs of the graph.
Q2. A soft sound has
A soft sound has low amplitude. Loudness of sound is directly related to the amplitude of vibration. A larger amplitude produces a louder sound, while a smaller amplitude produces a softer sound. Pitch depends on frequency, not amplitude, so a soft sound does not necessarily have high pitch or high frequency.
Q3. Frequency of a sound wave is represented by
In physics, frequency is represented by the Greek letter ‘ν’ (nu). It is measured in hertz (Hz). T represents time period, A represents amplitude, and λ (lambda) represents wavelength. Frequency is the number of oscillations per unit time, denoted by ν.
Q4. Amplitude is represented by the symbol
Amplitude is represented by the symbol ‘A’. It is the maximum displacement of particles from their mean position. λ represents wavelength, T represents time period, and ν represents frequency. Amplitude determines the loudness of a sound.
Q5. In a longitudinal wave, the regions where coils are close together are called
In a longitudinal wave, the regions where coils (or particles) are close together are called compressions. These are regions of high density and high pressure. Rarefactions are regions where coils are spread apart (low density). Crests and troughs are terms used for transverse waves.
Q6. One complete oscillation of density change corresponds to
One complete oscillation of density change (from compression to rarefaction and back to compression) corresponds to one complete cycle. One cycle consists of one compression and one rarefaction. Frequency is the number of cycles per second, and half vibration is only half a cycle.
Q7. The graph of a loud sound compared to soft sound shows
A loud sound has a larger amplitude compared to a soft sound. The amplitude of a wave is the maximum displacement from the mean position. A larger amplitude means more energy and greater loudness. The speed and wavelength of sound in the same medium do not change with loudness.
Q8. As frequency increases, wavelength in the same medium
For a sound wave in the same medium, speed is constant. The relationship between speed, frequency, and wavelength is v = ν × λ. If frequency (ν) increases, wavelength (λ) must decrease to keep the speed constant. This is an inverse relationship.
Q9. Noise is defined as sound that is
Noise is defined as sound that is unpleasant, irregular, or unwanted. Music is sound that is pleasant and harmonious. The distinction between noise and music is subjective and depends on the listener, but in physics, noise is typically characterized as irregular and unpleasant.
Q10. The SI unit of wavelength is
Wavelength is the distance between two consecutive compressions or rarefactions. It is a measure of length, so its SI unit is metre (m). Hertz is the unit of frequency, second is the unit of time, and Pascal is the unit of pressure.
Q11. A low pitch sound corresponds to
Pitch is directly related to frequency. A low pitch sound corresponds to a low frequency. A high pitch sound corresponds to a high frequency. Speed and amplitude do not determine pitch directly.
Q12. Pitch is related to
Pitch is related to frequency. Higher frequency means higher pitch, and lower frequency means lower pitch. Amplitude affects loudness, density affects speed, and energy is related to amplitude and frequency.
Q13. A loud sound has
A loud sound has large amplitude. Amplitude determines the loudness of sound. A larger amplitude means more energy and greater loudness. Low frequency would affect pitch, not loudness.
Q14. The regions where coils of a slinky are farther apart are known as
In a slinky, regions where coils are farther apart are known as rarefactions. These are regions of low density and low pressure. Compressions are regions where coils are close together. Crests are for transverse waves, and nodes are points of zero displacement.
Q15. Sound quality is also known as
Sound quality is also known as timbre. It is the characteristic that allows us to distinguish between two sounds of the same pitch and loudness produced by different sources. Timbre depends on the waveform and the presence of overtones. Pitch relates to frequency, and loudness relates to amplitude.
Q16. A sound of single frequency is called
A sound of a single frequency is called a tone. A note is a sound of a specific pitch, often composed of multiple frequencies. Music is a pleasant combination of sounds, and noise is unpleasant. A pure tone has only one frequency.
Q17. Regions of low pressure in a sound wave are called
Regions of low pressure in a sound wave are called rarefactions. In a sound wave, compressions are regions of high pressure, and rarefactions are regions of low pressure. Crests and peaks are terms used for transverse waves.
Q18. A valley in a wave graph represents
In a wave graph, a valley (lower portion) represents a rarefaction, which is a region of low pressure. A crest (upper portion) represents a compression, which is a region of high pressure. In a sound wave, valleys correspond to rarefactions and peaks correspond to compressions.
Q19. More compressions passing a point per second means
More compressions passing a point per second means higher frequency. Higher frequency corresponds to higher pitch. Amplitude determines loudness, and lower frequency would give lower pitch. The number of compressions passing per second is a measure of frequency.
Q20. Time period is represented by the symbol
Time period is represented by the symbol T. It is the time taken to complete one oscillation. A represents amplitude, ν represents frequency, and λ represents wavelength. The time period and frequency are related by T = 1/ν.
Q21. Loudness is related to
Loudness is related to amplitude. A larger amplitude produces a louder sound. Pitch is related to frequency, and speed is the rate of propagation of sound. Loudness is directly proportional to the square of the amplitude.
Q22. When a sound travels away from its source, its amplitude
When a sound travels away from its source, its amplitude decreases. This is because the energy of the sound wave spreads out over a larger area as it travels, reducing the intensity and amplitude. The sound becomes fainter with distance.
Q23. Amplitude of sound depends on
The amplitude of sound depends on the force of vibration. A greater force applied to the vibrating object produces a larger amplitude. The medium affects speed, frequency affects pitch, but amplitude is determined by the energy with which the object vibrates.
Q24. The time taken for one complete oscillation is called
The time taken for one complete oscillation is called the time period (T). Amplitude is the maximum displacement, frequency is the number of oscillations per second, and pitch is the perceived frequency. The time period is the duration of one cycle.
Q25. The relationship between frequency and time period is
Frequency (ν) and time period (T) are inversely related. The relationship is ν = 1/T. This means that as the time period increases, the frequency decreases, and vice versa. The product of frequency and time period is always 1 (ν × T = 1).
Q26. Music is sound that is
Music is defined as sound that is pleasant and harmonious. It is organized and has a regular pattern. Noise is unpleasant and irregular. The distinction is subjective, but in physics, music is often characterized by regular waveforms and harmonious frequencies.
Q27. The SI unit of time period is
The SI unit of time period is the second (s). Time period is the time taken for one complete oscillation, so it is measured in seconds. Hertz is the unit of frequency, metre is the unit of wavelength, and Pascal is the unit of pressure.
Q28. Loudness of a sound mainly depends on
The loudness of a sound mainly depends on amplitude. A larger amplitude produces a louder sound. Pitch depends on frequency, and speed is the rate of propagation. The loudness is directly proportional to the square of the amplitude of vibration.
Q29. Hitting a table hard produces louder sound because
Hitting a table hard produces a louder sound because the amplitude of vibration increases. A harder hit means more force, which causes the table to vibrate with greater amplitude. The pitch (frequency) and speed of sound in the medium do not change significantly.
Q30. Sound propagates through a medium as a series of
Sound propagates through a medium as a series of compressions (high pressure) and rarefactions (low pressure). These are the fundamental features of longitudinal waves. Heat and light waves are different, electric pulses are not sound, and crests and troughs are for transverse waves.
Q31. Two sounds having same frequency but different amplitude will differ in
Two sounds having the same frequency but different amplitude will differ in loudness. Frequency determines pitch, so they would have the same pitch. Amplitude determines loudness, so a larger amplitude would produce a louder sound. Wavelength and speed in the same medium would be the same if frequency is the same.
Q32. Which wave property determines (a) loudness and (b) pitch respectively?
Loudness is determined by amplitude, and pitch is determined by frequency. A larger amplitude means louder sound, and a higher frequency means higher pitch. Speed and wavelength affect other properties but not these directly. Therefore, amplitude and frequency are the correct pair.
Q33. The SI unit of frequency is
The SI unit of frequency is hertz (Hz), named after Heinrich Hertz. One hertz is equal to one oscillation per second. Decibel is the unit of loudness, metre is the unit of wavelength, and second is the unit of time period.
Q34. Louder sounds can travel farther because they have
Louder sounds can travel farther because they have higher energy (larger amplitude). The higher energy allows the sound wave to travel a greater distance before its amplitude decreases to the point of being inaudible. Speed, pitch, and frequency do not directly determine how far a sound travels.
Q35. The characteristic that helps us distinguish two sounds of same pitch and loudness is
The characteristic that helps us distinguish two sounds of the same pitch and loudness is quality (timbre). Quality depends on the waveform and the presence of overtones. Amplitude and frequency determine loudness and pitch, respectively, but quality is what makes a violin sound different from a piano playing the same note.
Q36. The SI unit hertz is named after
The SI unit hertz (Hz) is named after the German physicist Heinrich Hertz, who made significant contributions to the study of electromagnetic waves. Maxwell, Einstein, and Newton are also famous scientists but have different units named after them (e.g., Maxwell is not a unit, Einstein is not a unit, and Newton is the unit of force).
Q37. A sound with higher frequency has
A sound with higher frequency has higher pitch. Pitch is the perceptual correlate of frequency. Higher frequency means more oscillations per second, which we perceive as a higher-pitched sound. The speed of sound in a medium is constant at a given temperature and does not depend on frequency.
Q38. Sound waves are classified as
Sound waves are classified as longitudinal waves because the particles of the medium vibrate parallel to the direction of wave propagation. Surface waves are a combination of transverse and longitudinal, electromagnetic waves do not require a medium, and transverse waves have particles vibrating perpendicular to the direction of propagation.
Q39. Violin and flute sound different even at same pitch because of
A violin and a flute sound different even when playing the same pitch because of quality (timbre). Timbre is determined by the waveform and the presence of overtones. Loudness, medium, and speed are the same if the instruments are playing at the same volume and in the same environment.
Q40. Two sounds with same pitch and loudness can still be distinguished due to
Two sounds with the same pitch and loudness can still be distinguished due to quality (timbre). Quality is the characteristic that depends on the waveform and overtones. Speed, wavelength, and medium would be the same for both sounds, but quality allows us to tell the difference between, for example, a piano and a guitar.
Q41. In a wave graph, a peak corresponds to
In a wave graph, a peak (upper portion) corresponds to a compression, which is a region of high pressure and high density. A valley (lower portion) corresponds to a rarefaction, which is a region of low pressure. Therefore, a peak represents compression.
Q42. The distance between two consecutive rarefactions equals
The distance between two consecutive rarefactions (or two consecutive compressions) equals one wavelength. Wavelength is the distance between two consecutive identical points in a wave, such as rarefaction to rarefaction or compression to compression.
Q43. The distance between two consecutive compressions is called
The distance between two consecutive compressions (or rarefactions) is called wavelength (λ). Frequency is the number of oscillations per second, amplitude is the maximum displacement, and time period is the time for one oscillation. Wavelength is a measure of the spatial period of the wave.
Q44. Frequency tells us
Frequency tells us how often an event occurs, i.e., the number of oscillations per second. It is measured in hertz (Hz). Loudness is determined by amplitude, speed is determined by the medium, and distance travelled is related to time and speed.
Q45. Objects of different sizes produce different pitch because they
Objects of different sizes produce different pitch because they vibrate at different frequencies. Smaller objects generally vibrate at higher frequencies (higher pitch), while larger objects vibrate at lower frequencies (lower pitch). The size affects the frequency of vibration.
Q46. The number of oscillations per unit time is called
The number of oscillations per unit time is called frequency. It is measured in hertz (Hz). Wavelength is the distance between two consecutive compressions, time period is the time for one oscillation, and amplitude is the maximum displacement.
Q47. Pitch of a sound depends on
Pitch of a sound depends on frequency. Higher frequency gives higher pitch. Energy and amplitude affect loudness, while speed is determined by the medium. Frequency is the primary determinant of pitch.
Q48. The symbol used to represent wavelength is
The symbol used to represent wavelength is λ (lambda). A represents amplitude, T represents time period, and ν represents frequency. Wavelength is the Greek letter lambda.
Q49. A pleasant sound produced by multiple frequencies is called
A pleasant sound produced by multiple frequencies is called a note. A tone is a sound of a single frequency. Music is a combination of notes, and noise is unpleasant. A note can be a combination of a fundamental frequency and its overtones.
Q50. Amplitude is defined as
Amplitude is defined as the maximum disturbance of a vibrating particle from its mean position. It is a measure of the displacement of particles in a wave. The number of oscillations is frequency, speed of sound is different, and distance between compressions is wavelength.