Question

why is sun normally yellow, but still we get all the colours of the spectrum

Answer 1

what is the question?
The sky is blue because the blue light is refracted the most in the earth's atmosphere
At sunset the light has to travel a longer distance and this is why you see red
Where is your observation point? space or earth? location matters
On earth because as stated earlier the blue is filtered out leaving red and green, colors of light not pigments, which are yellow when combined in equal amounts.
From outer space the sun is a white object
a site is attached
http://www.universetoday.com/42268/why-is-the-sun-yellow/

Answer 2

The color is also related to the surface temperature... see Wein's Law

Answer 3

if by 'colors' of the spectrum you mean visible light, then i would say earth's atmosphere is reflecting or absorbing more blue than red and green, leaving us with yellowish visible light on the earth's surface. we do receive all the colors of the spectrum, just different amounts of them. different amounts amounts to different perceived colors.

if instead you mean all wavelengths of light, then we most certainly do not receive all the colors of the spectrum. most high frequency light from the sun is filtered so that we don't die instantly.

Answer 4

I guess the spectral intensity has a peak at yellow.

Answer 5

no, it has a peak at 502 nm - green - which is what we've been tying to point out