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Waves

Question

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An observer is approaching with velocity v towards a light source. If the velocity of light is c, then velocity of light with respect to observer will be

c - v

c

c + v

$\sqrt{1 - \frac{v^{2}}{c^{2}}}$

Solution

C.

c + v

According to the Doppler effect

Here both source and observer moving

Observer and light are moving towards each other, so relative velocity is c + v.

Some More Questions From Waves Chapter

When two tuning forks (fork 1 and fork 2) are sounded simultaneously, 4 beats per second are heard. Now, some tape is attached on the prong of the fork 2. When the tuning forks are sounded again, 6 beats per seconds are heard. If the frequency of fork 1 is 200 Hz, then what was the original frequency of fork 2?

The sound waves after being converted into electrical waves are not transmitted as such because

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