Question

[BWS.02]Look at the spectrum of Star 1 which is moving towards Earth and the spectrum of Star 2 which is moving away from Earth. The band in the middle represents the spectrum of a motionless light source.
Which of these is a correct inference that can be draw from the observation of the three spectrums?

The spectrum shifts towards the red region when the star moves towards Earth.
The spectrum shifts towards the blue region when the star moves towards Earth.
The spectrum is identical for moving stars and motionless stars.
The spectrum is identical for stars moving away from Earth and stars moving towards Earth.

Answer 1

Answer:

The spectrum of a star shifts towards the blue region when the star moves towards Earth.

Explanation:

This is referred to as the Doppler shift effect. As the star moves closer to the observer, the wavelength of light it produces is ‘compressed’ hence changing its relative frequency (just like the pitch of the siren of an ambulance approaching you).

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