Question

In: Physics

We see light from a distant quasar as the color lamda=3um. If the quasar is moving...

We see light from a distant quasar as the color lamda=3um. If the quasar is moving away from us at .95c what color was the light when it was emitted from the quasar and is it visible to our eyes?

If someone on this distant quasar beamed an X-ray laser (lamda=1nm) towards us, what color would the laser appear to us and would it be visible to our eyes?

please show step by step thank you!

Expert Solution

a) The quasar is moving away from us.

So, the light will undergo red shift.

The equation for gravitational redshift is

Here, the observed wavelength = 3*10^-6 m

v = 0.95 c

So,

The visible light is of wavelength 400-700 nm

This light will not be visible to us, and will be in the infrared region.

b) Here, the emitted wavelength is 1 nm

So,

Again, the light will not be visible to us, and will be in the X ray wavelength itself.

genius_generous answered 3 years ago

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