Question

"Suppose a galaxy is moving away from the earth at a speed 0.825 c. It emits radio waves with a wavelength of 0.525 m. What wavelength would we detect on the earth?"​

Answer 1

Answer:

The wavelength we calculated is 1.70 m

Explanation:

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Answer 2

Answer:

The wavelength observed on earth is 0.95m.

Explanation:

Given:

v = 0.825c m/sec

w = 0.525m

Here,

The speed of the galaxy is denoted by V.

The wavelength observed on earth is denoted by w'.

The wavelength that emits by a galaxy is denoted by w.

Now,

By the equation,

$w'=w(\frac{c+v}{C} )\\w'=0.525(\frac{c+0.825c}{c} )\\w' =0.95m$

So, the wavelength observed on earth is 0.95m.