What is the color of the peak frequency of solar radiation when it is plotted versus wavelength?

When someone slams her books on a table the kinect energy is transferred into vibrations that travel to your ears as sound waves which statement describes the movement of those waves

Two polarizers are oriented at 70∘∘ to one another. unpolarized light falls on them. what fraction of the light intensity is transmitted?

In a system, when potential energy decreases, then entropy also decreases. true false