NEET Waves PYQs with Solutions – Practice Now

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Topic Question Set

Q 1 :

The displacement of a travelling wave $y = C \sin \frac{2 π}{λ} (a t - x)$ where $t$ is time, $x$ is distance and $λ$ is the wavelength, all in S.I. units. Then frequency of the wave is [2024]

$\frac{2 π λ}{a}$
$\frac{2 π a}{λ}$
$\frac{λ}{a}$
$\frac{a}{λ}$

1

2

3

4

(4)

Given, $y = C \sin \frac{2 π}{λ} (a t - x)$ ...(i)

Equation of a travelling wave is given by

$y = a \sin (ω t - k x)$ ...(ii)

From equation (i) and (ii), $ω = \frac{2 π a}{λ}$

As, $ω = 2 π υ$

$2 π υ = \frac{2 π a}{λ} so, υ = \frac{a}{λ}$

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