Question

The wavelength of a wave is 20 cm, find the number of waves in one second if the wave velocity is 100 m/s.​

Answer 1

Explanation:

Correct option is

C

8.33×10

−3

s

In the question, the wavelength (λ) is given as 20 cm, that is, 0.20 m and the wave velocity, v is given as 24 m/s.

The frequency ν, velocity v and wavelength λ relation is given as:

ν=

λ

v

.

Number of waves produced in one second is called as frequency, i.e. ν=

λ

v

=ν=

0.20

24

=120 waves per second.

Time period of a wave is given as the inverse of frequency.

That is, T=

ν

1

=

120

1

=8.33×10

−3

seconds

Hence, the time period of the wave is given as 8.33×10

−3

seconds.

Answer 2

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