Question

The James Webb Space Telescope (JWST) will allow us to look back in time and observe the early universe. You are a scientist trying to observe an object that emitted its light a long time ago.
(a) Explain why the light you receive from the object is red-shifted.

The object has a redshift of 7.6 and the JWST observes the object at a wavelength of 2 microme- tres (mid-infrared light).

(b) What is the wavelength of the light emitted by the object?
(c) What type of radiation was originally emitted by the object?



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Answer 1

#a

This is because red color has higher wavelength and it can clear universe and our atmosphere better,

This has the same reason as how we can see only red color during sunset.

#b

$\boxed{\sf z=\dfrac{ \lambda-\lambda_o}{\lambda_o}}$

lambda_o be x

Put values

$\\ \rm\Rrightarrow 7.6=\dfrac{2\times10^{-6}-x}{x}$

$\\ \rm\Rrightarrow 7.6=\dfrac{2\times 10^{-6}}{x}-1$

$\\ \rm\Rrightarrow 8.6=\dfrac{2\times 10^{-6}}{x}$

$\\ \rm\Rrightarrow x=0.23\times 10^{-6}m$

$\\ \rm\Rrightarrow x=0.23\mu m$