A source and an observer approach each other with same velocity 50 m/s . If the apparent frequency is `435 sec^( –1)`, then the real frequency isA. 320 sB. 360 secC. 390 secD. 420 sec

A source and an observer approach each other with same velocity 50 m/s

1.	A source and an observer approach each other with same velocity 50 m/s . If the apparent frequency is `435 sec^( –1)`, then the real frequency isA. 320 sB. 360 secC. 390 secD. 420 sec
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A source and an observer approach each other with same velocity 50 m/s . If the apparent frequency is `435 sec^( –1)`, then the real frequency isA. 320 sB. 360 secC. 390 secD. 420 sec

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