Question

If astronomers look toward any point in outer space, they see radiation that matches the emission...

If astronomers look toward any point in outer space, they see radiation that matches the emission spectrum of an object at 2.7 K, a remnant of the Big Bang.

a) What is the peak wavelength of this radiation? (lambda = ?)

b) What part of the electormagnetic spectum is it in?

Radio Region

Microwave Region

Visible Region

Ultraviolet Region

X-Rays Region

Gamma-Rays Region

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Answer #1

From the Weins displacemnt law , the peak wave length is

lamda ( peak) T = b

where b is Weins constant

lamda ( peak) = b/T = 2.898 * 10 ^-3 K/2.7 K = 1.07 mm

(b)

micro wave region

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