First slide

Introduction to waves

Question

The wavelength of ultrasonic waves in air is of the order of

Easy

A

$5 \times 10^{- 5} cm$
B

$5 \times 10^{- 8} cm$
C

$5 \times 10^{5} cm$
D

$5 \times 10^{8} cm$

Solution

$λ = \frac{v}{n}; n \approx 50, 000 Hz, v = 330 m / \sec \Rightarrow λ = \frac{330}{50000} m$
$= 6 .6 \times 10^{- 5} cm \approx 5 \times 10^{- 5} cm$

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