Max Planck contributed to the development of quantum theory with his theory of "quanta." Which of the following indicates how Planck arrived at his theory of "quanta"?

Question

veeveeniko · Answer

Atoms of neon gas and sodium vapor are excited electronically, subsequently emitting different colors; red-orange and yellow, respectively.
	
A solid black object is heated on a stove burner. Depending on the length of time exposed to the heat of the burner, the black object will appear red when containing less heat energy and appear white when containing more heat energy.
	
The surface of a clean piece of metal is exposed to a light source. During exposure, the surface of the metal emits electrons.
	
Electrons are passed through a crystal and are diffracted.

gebooors · Answer

Planck invented "black body radiation"

C) is photoelectric effect explained by Einstein, 
D) is work by Bragg