Which of the following is correct about ...

Which of the following is correct about Doppler effect?

The Doppler effect is the apparent change in the frequency due to relative motion between the source and the listener

The Doppler effect is used to measure the speed of automobiles in police radar system.

Doppler effect exists when either source or listener or both `"is"//"are"` moving with respect to the other

All of the above

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SOUND
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Which of the following is correct about "El Nino effect"?

temperature rise leads to odd climatic changes

cutting down the use of fossil fuels.

planting trees

slowing down the growth of human population

It encourages the activity of osteoclasts

It lowers blood `Ca^(2+)` level

In its absence, body shivers due to constant muscle contraction

It stimulates absorption of `Ca^(2+)` by in testinal tract

Shock waves

Ultrasonic waves

Sonic waves

Electromagnitic waves