Question

A sound wave is shown graphically. If the speed of
sound wave is 350 m/s, then wavelength of sound
wave is approximately
0.25
Displacement
Time (ms)
(1) 0.2 m
(3) 0.5 m
(2) 2 m
(4) 0.05 m​

Answer 1

Answer:

answer is 2 m

Right option 2

Answer 2

Given,

speed of sound wave = 350 m/s

wavelength of wave = 0.25

To find,

The displacement of the sound wave with 350 m/s speed

Solution,

The speed of sound wave formula is given as,

v = f × λ

where,

v = speed of sound

f = frequency of sound wave

λ = wavelength of sound

In 1 millisecond, the wavelength of wave is 7/4 (according to figure)

Therefore, frequency = 7/4 Hz

10⁻³ second = 7/4 × 10⁻³ oscillations

v = f × λ

350 = 7/4 × 10⁻³ × λ

λ = 350 ÷ (7/4 × 10⁻³)

λ = 0.2 m

Therefore the wavelength of sound is approximately 0.2 m.