All solids above 1000 k begin to emit radiation in what range on the electromagnetic scale?

radio
infrared
visible light
ultraviolet

Infrared

Explanation:

Wien's displacement law states that the peak wavelength of the radiation emitted by an object is given by

where

is the Wien's displacement constant

T is the absolute temperature of the object

In this problem,

T = 1000 K

So the peak wavelength of the radiation emitted by the body is

And this corresponds to infrared radiation, whose range of wavelength is 700 nm - 1 mm.

the working equation for the angular size is the product of the physical size and 360 degrees divided by the product of two pi and distance from earth. the minimum size would be 0.559 degrees while the maximum size would be 0.49 degrees. 

option number c is the right answer.