1) Light from a stationary spaceship is observed by an observer on Earth, then t

Question

1) Light from a stationary spaceship is observed by an observer on Earth, then the spaceship moves directly away from the observer at high speed while still emitting the light. As a result, the light seen by the observer has:

a) a higher frequency and a longer wavelength than before

b) a lower frequency and a shorter wavelength than before

c) a higher frequency and a shorter wavelength than before

d) a lower frequency and a longer wavelength than before

e) the same frequency and wavelength as before

Explanation / Answer

As the spaceship is moving away, according to doppler's effect the frequency is less than the actual and hence the wavelength is longer than the actual.therefore the correct option is d.

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