Chapter 12: Q7MCQ (page 328)
When a sound wave passes from air into water, what properties of the wave will change?
(a) Frequency.
(b) Wavelength.
(c) Wave speed.
(d) Both frequency and wavelength.
(e) Both wave speed and wavelength.
The correct option is (e).
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On a warm summer day \(\left( {31^\circ {\rm{C}}} \right)\), it takes 4.80 s for an echo to return from a cliff across a lake. On a winter day, it takes 5.20 s. What is the temperature on the winter day?
(a) At \(T{\bf{ = 22^\circ C}}\) how long must an open organ pipe be to have a fundamental frequency of \({\bf{294}}\;{\bf{Hz}}\)? (b) If this pipe is filled with helium, what is its fundamental frequency?
A hiker determines the length of a lake by listening for the echo of her shout reflected by a cliff at the far end of the lake. She hears the echo 2.5 s after shouting. Estimate the length of the lake.
Question: (I) Estimate the number of octaves in the human audible range, 20 Hz to 20 kHz.
If two firecrackers produce a combined sound level of 85 dB when fired simultaneously at a certain place, what will be the sound level if only one is exploded? [Hint: Add intensities, not dBs.]
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