Science
Voice of which of the following is likely to have a minimum frequency?
- Baby girl
- Baby boy
- A man
- A woman
Sound
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Answer
A man
Reason — The frequency of a sound is proportional to its pitch. An adult man's voice has a lower pitch than the voices of a baby boy, a baby girl, and a woman.
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Related Questions
Sound can travel through
- gases only
- solids only
- liquids only
- solids, liquids and gases
In the following statements, tick 'T' against those which are true and 'F' against those which are false.
(a) Sound cannot travel in a vacuum. (T/F)
(b) The number of oscillations per second of a vibrating object is called its time period. (T/F)
(c) If the amplitude of the vibration is large, the sound is feeble. (T/F)
(d) For human ears, the audible range is 20 Hz to 20,000 Hz. (T/F)
(e) The lower the frequency of vibration, the higher is the pitch. (T/F)
(f) Unwanted or unpleasant sound is termed as music. (T/F)
(g) Noise pollution may cause partial hearing impairment. (T/F)
Fill in the blanks with suitable words.
(a) Time taken by an object to complete one oscillation is called ……………
(b) Loudness is determined by the …………… of vibration.
(c) The unit of frequency is ……………
(d) Unwanted sound is called ……………
(e) Shrillness of a sound is determined by the …………… of vibration.
A pendulum oscillates 40 times in 4 seconds. Find its time period and frequency.