For the wave shown in figure, the wavelength and frequency,... | PHYSICS - DOPPLER EFFECT | SolveeIt | Solveeit

Today, August 19

Question

For the wave shown in figure, the wavelength and frequency, if its speed is 320 m/sec, are –

A

8 cm , 400 Hz

B

80 cm, 40 Hz

C

8 cm, 4000 Hz

D

40 cm, 8000 Hz

Answer

8 cm, 4000 Hz

Explanation

Solution

As per fig.

l + l + l/2 = 20 cm

or $\frac { 5 \lambda } { 2 }$ = 20

\ l = 8 cm = 0.08 m

Q v = nl

\ 320 = n (0.08)

\ n = = 4000 Hz