Question

tuning forks A and B are sounded against a reference tuning fork R folks A and B are longer in length compared to R when a sounded against R beat frequency heard is 4Hz .when B is sounded against R beat frequency heard is 8 Hz .In frequency of A is 400Hz find wavelength of sound emitted by fork B .velocity of sound =343m/s
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Answer 1

The wavelength of Vb is 1.15 m

Explanation:

• The difference in beats of A and B = 8 Hz - 4 Hz
• The difference in beats of A and B = 4 Hz
• The formula of beat frequency = b | VA - VB|

b =   VA - VB

VB = b - VA

- VB = 4 - 400

- VB = - 396

VB = 396 Hz

The wavelength of B

λ = V / f

396 = 343 / λ

λ = 396 / 343

λ = 1.15 m