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Alik [6]
3 years ago
12

If 20 beats are produced within a single second, which of the following frequencies could possibly be held by two sound waves tr

aveling through a medium along a common path at the same time
A. 38 Hz and 63 Hz
B. 18 Hz and 26 Hz
C. 47 Hz and 55 Hz
D. 22 Hz and 42 Hz
Physics
2 answers:
solong [7]3 years ago
6 0
If 20 beats are produced within one second the frequencies that could possibly be held by two sound waves traveling through a medium along a common pants at the same time are <span>b. 22  and 42 </span>
zhuklara [117]3 years ago
4 0

The correct choice is

D. 22 Hz and 42 Hz.

In fact, the beat frequency is given by the difference between the frequencies of the two waves:

f_B = |f_1 -f_2|

In this problem, the beat frequency is f_B=20 Hz, therefore the only pair of frequencies that gives a difference equal to 20 Hz is

D. 22 Hz and 42 Hz.

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Which part of the central nervous system controls reflexes?
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You look down an old well, cannot see the bottom, and mutter to yourself "Oh well!". In order to estimate the depth of the well,
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Answer:

The best estimate of the depth of the well is 2.3 sec.

Explanation:

Given that,

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t_{1}=2.19\ sec

t_{2}=2.30\ sec

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t_{4}=2.29\ sec

t_{5}=2.27\ sec

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According to record time,

We can write of the record time

t_{1}=2.19\approx 2.2\ sec

t_{2}=2.30\approx 2.3\ sec

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t_{5}=2.27\approx 2.3\ sec

Here, all time is nearest 2.3 sec.

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Hence, The best estimate of the depth of the well is 2.3 sec.

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