Question

For a Sound of wavelength lo com and tregtig
10Hz, the velocity of the sound wave it
ay 10 cm/sec by 5cm/sec
c) 100cm/sec.​

Answer 1

Explanation:

given

two Sound waves of wavelengths

40 cm → 0.4 m

40.5 cm → 0.45 m

formed 10 beats in 1 second

let the speed of sound be

′

v

′

beat frequency =

1

10

=10 Hz

but

beat frequency =∣f

1

−f

2

∣ →(2)

Since f

λ

=v→

f

1

=

0.4

v

f

2

=

0.45

v

⎭

⎪

⎬

⎪

⎫

→

∣

∣

∣

∣

0.4

v

−

0.45

v

∣

∣

∣

∣

=10

2.5v−2.4v=10

V=100 m/s