Loudness and Amplitude
Physics ⇒ Waves and Sound
Loudness and Amplitude starts at 7 and continues till grade 12.
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See sample questions for grade 12
A sound has an intensity level of 70 dB. If another sound is 10 times more intense, what is its intensity level in dB?
A sound has an intensity of 1 × 10-6 W/m2. Calculate its intensity level in decibels (dB) given that the threshold of hearing is 1 × 10-12 W/m2.
A sound wave has an amplitude of 0.02 m. If the amplitude is reduced to 0.01 m, what happens to the loudness?
A sound wave has an amplitude of 0.05 m and produces a certain loudness. If the amplitude is tripled, by what factor does the loudness change?
A sound wave has an intensity of 5 × 10-7 W/m2. What is its intensity level in dB? (I0 = 1 × 10-12 W/m2)
A speaker emits a sound with a power output of 2 W. If you are standing 4 m away from the speaker, what is the intensity of the sound at your location? (Assume sound spreads uniformly in all directions.)
Describe how the human ear perceives loudness and how it differs from the physical measurement of amplitude.
Describe the difference between sound intensity and loudness.
Which of the following best describes the relationship between the amplitude of a sound wave and its loudness?
(1) Loudness is directly proportional to amplitude
(2) Loudness is inversely proportional to amplitude
(3) Loudness is proportional to the square of amplitude
(4) Loudness is independent of amplitude
Which of the following best explains why a whisper and a shout of the same frequency sound different?
(1) They have different amplitudes
(2) They have different wavelengths
(3) They have different speeds
(4) They have different timbres
Which of the following is NOT a factor affecting the loudness of a sound?
(1) Amplitude
(2) Frequency
(3) Distance from the source
(4) Wavelength
Which of the following is NOT true about amplitude?
(1) It is the maximum displacement from the mean position
(2) It determines the pitch of the sound
(3) It is measured in meters
(4) It affects the loudness of the sound
Fill in the blank: The ________ of a sound wave determines its loudness, while the ________ determines its pitch.
Fill in the blank: The reference intensity (I0) used in the calculation of sound intensity level is ________ W/m2.
Loudness is a ________ perception, while amplitude is a ________ quantity.
The unit of sound intensity level is ________.
True or False: The amplitude of a sound wave can be negative.
True or False: The decibel scale is a logarithmic scale used to measure sound intensity levels.
True or False: The intensity of a sound wave is proportional to the square of its amplitude.
True or False: The loudness of a sound depends only on its frequency.
