Question

20 waves pass through a point in 2 seconds. If the distance between one crest and
adjacent trough is 1.5 m. Calculate (a) the frequency, (b) the wavelength.

Answer 1

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QUESTION :

20 waves pass through a point in 2 seconds. If the distance between one crest and adjacent trough is 1.5 m.

Calculate :

(a) the frequency

(b) the wavelength

SOLUTION :

In the above Question, the following information is given.

20 waves pass through a point in 2 seconds.

So, in 1 second, only 10 waves passes through that point.

So the required frequency becomes 10 Hz

The distance between one crest and adjacent trough is 1.5 m.

We know that the wavelength is equal to the distance between any two consecutive crests or troughs.

So ,

Wavelength = 1.5 m × 2

=> The wavelength is 3 m.

ANSWER :

The frequency of the above wave is 10 Hz and it's wavelength is 3 m.

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ADDITIONAL INFORMATION :

For solving these kinds of problems, we use the following Formulas :

F = 1 / T = No of oscillations per second.

V = f × { Lambda }

Where,

V is the velocity of the wave.

F is the frequency of the wave.

Lambda is the wavelength of the wave.

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Answer 2

v=f.lemda

Explanation:

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