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Grade 12Wave Motion

I wanted to know the solution for the question on Doppler’s effect in the JEE Main 2015 ONLINE exam conducted on 10th April. The question is:
A bat moving at 10 ms-1 towards a wall sends out a signal of 8000Hz towards it. On reflection it hears a frequency f. Value of f in hertz is:
(Speed of sound = 320 ms-1)
1. 8424 2. 8000 3. 8258 4. 8516

Profile image of Varun
11 Years agoGrade 12
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3 Answers

Profile image of Saurabh Kumar
11 Years ago
(f2)apparent = (f1)apparent (vsound + vobs / vsound)

(f1)apparent = (f0)( vsound/ vsound – vsource)

Put the value get the answer....
Profile image of Varun
11 Years ago
I know that, I am confused with the conventions
Profile image of pa1
10 Years ago
 
)source – vsound/ vsound)( v0 = (fapparent)1)(fsound / vobs + vsound (vapparent)1 = (fapparent)2 (f

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