Compared to a white-skinned person,what does a dark-skinned person experience?

Which of the following statements is wrong?

The following graph shows the correct variation in the intensity of heat radiations emitted by a black body with respect to frequency at different fixed temperatures. Identify the correct graph.

$A$ sphere,a cube,and a thin circular plate,all made of the same material and having the same mass,are heated to the same temperature of $200^{\circ} C$. When these are left in a room,which one reaches room temperature the fastest?

If the absorptance and reflectance of a surface are $0.4$ and $0.6$ respectively,then:

Write a short note on the Greenhouse Effect.