First slide

Doppler

Question

Two stars P and Q are observed at night. Star P appears reddish white while star Q as white. From this, we conclude

Moderate

A

temperature of Q is higher than that of P
B

temperature of Q is lower than that of P
C

star Q is at a distance as that of star P
D

star P is farther away than star Q

Solution

Farther stars move away from us faster and due to red shift the colour is red.

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