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in Physics by (63.7k points)

A train standing at the outer signal of a railway station blows a whistle of frequency 400 Hz in still air. 

1. What is the frequency of the whistle for a platform observer when the train approaches the platform with a speed of 10 m/s 

(a) 300 Hz 

(b) 412.12 Hz 

(c) 350 Hz 

(d) 360.50 Hz 

2. What is the frequency of the whistle for a platform observer when the train recedes from the platform with a speed of 10 m/s ? 

(a) 400.60 Hz 

(b) 528.75 Hz 

(c) 574.65 Hz 

(d) none of these 

3. What is the frequency of sound in each case ? 

(a) 340 Hz 

(b) 350 Hz 

(c) 360 Hz 

(d) 370 Hz

1 Answer

+1 vote
by (71.1k points)
selected by
 
Best answer

Correct option: 1 - (b), 2 - (c), 3 - (a)

Explanation: 

The speed of sound will be same in both the cases i.e., 340 m/s. In the case when train is approaching the platform, the apparent frequency

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