Question

Q43. A church bell rings at a frequency of 700 Hz every hour. What will be the frequency heard by a man on a train, moving away from the
church at the speed of 40 m/s?
I will mark you as brainliest if you answer me fast

Answer 1

The frequency of sound heard by a man on a train, moving away from the church is 617.64 Hz.

A church bell rings at a frequency of 700 Hz every hour.

We have to find the frequency heard by a man on a train, moving away from the church at the speed of 40 m/s.

We have to use Doppler's effect,

If observer is moving away from the stationary source,

$f=\left(\frac{v-v_0}{v}\right)f_0$

• Where f₀ is initial frequency.
• v is the speed of sound.
• v₀ is the speed of observer.
• f is apparent frequency observed by observer.

Here,

f₀ = 700 Hz, v = 340 m/s , v₀ = 40 m/s

∴ f = (340 - 40)/340 × 700

= 21000/34

= 617.64 Hz

Therefore the frequency of sound heard by man on a train is 617.64Hz.

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