Physics
Write true or false for each statement:
(a) When sound propagates in air, it does not carry energy with it.
(b) In a longitudinal wave, compression and rarefaction are formed.
(c) The distance from one compression to nearest rarefaction is called wavelength.
(d) The frequency is measured in second.
(e) The quality of a sound depends on the amplitude of wave.
(f) The pitch of sound depends on frequency.
(g) Decibel is the unit of pitch of a sound.
Sound
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Answer
(a) False
Correct Statement — When sound propagates in air, it carries energy with it.
(b) True
(c) False
Correct Statement — The distance between two consecutive compressions or between two consecutive rarefactions is equal to one wavelength.
(d) False
Correct Statement — The frequency is measured in hertz.
(e) False
Correct Statement — The quality of a sound depends on the wave form.
(f) True
(g) False
Correct Statement — Decibel is the unit of loudness of a sound.
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Related Questions
Assertion (A) : Loudness and quality of sound are independent of each other.
Reason (R) : Loudness depends on amplitude while quality of sound depends on the waveform of sound.
- Both A and R are true and R is the correct explanation of A
- Both A and R are true and R is not the correct explanation of A
- Assertion is true but reason is false
- Assertion is false but reason is true
Fill in the blanks:
(a) The time period of a wave is 2 s. Its frequency is …………… .
(b) The pitch of a stringed instrument is increased by …………… tension in string.
(c) The pitch of a flute is decreased by …………… length of air column.
(d) Smaller the membrane, …………… is the pitch.
(e) If a drum is beaten hard, its loudness …………… .
(f) A tuning fork produces sound of …………… frequency.
Match the following:
Column A Column B (a) Amplitude (i) frequency (b) Frequency (ii) amplitude (c) Loudness (iii) maximum displacement on either side (d) Pitch (iv) presence of other frequencies (e) Wave form (v) 1/Time period How does sound travel in air?