1
MHT CET 2021 24th September Evening Shift
+1
-0

Velocity of sound waves in air is '$$\mathrm{V}$$' $$\mathrm{m} / \mathrm{s}$$. For a particular sound wave in air, path difference of 'x' $$\mathrm{cm}$$ is equivalent to phase difference $$n \pi$$. The frequency of this wave is

A
$$\frac{V n}{x}$$
B
$$\frac{V}{n x}$$
C
$$\frac{V n}{2 x}$$
D
$$\frac{2 x}{V}$$
2
MHT CET 2021 24th September Evening Shift
+1
-0

The length and diameter of a metal wire used in sonometer is doubled. The fundamental frequency will change from 'n' to

A
$$\frac{n}{4}$$
B
2n
C
2n
D
$$\frac{n}{2}$$
3
MHT CET 2021 24th September Evening Shift
+1
-0

A closed organ pipe and an open organ pipe of same length produce 2 beats per second when they are set into vibrations together in fundamental mode. The length of open pipe is now halved and that of closed pipe is doubled. The number of beats produced per second will be

A
4
B
3
C
8
D
7
4
MHT CET 2021 24th September Morning Shift
+1
-0

A sonometer wire of length 25 cm vibrates in unison with a tuning fork. When its length is decreased by 1 cm, 6 beats are heard per second. What is the frequency of the tuning fork?

A
200 Hz
B
72 Hz
C
100 Hz
D
144 Hz
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