Question

Betelgeuse - the right shoulder star of Orion - is a red giant star. Its radiation peaks in the infrared at λ = 800 nm. What is the surface temperature of the star?

Answer 1

3622.5 K

Step-by-step explanation:

The radiation of red giant star is 800nm.

We need to find the surface temperature of the star. Let it is T.

Using Wein's displacement law to find it as follows :

`\lambda=(C)/(T)`

C is constant an T is temperature

`T=(C)/(\lambda)\\\\T=(2.898* 10^(-3))/(800* 10^(-9))\\\\ T=3622.5\ K`

So, the surface temperature of the star is 3622.5 K.