Question

If red light can cause an electron to be ejected from the surface of a piece of cobalt, which of the following statements is most likely true?

A. Only blue light would also cause an electron to be ejected from cobalt.

B. Only light in the ultraviolet region of the electromagnetic spectrum could also cause an electron to be ejected from cobalt.

C. All other colors of light in the visible spectrum would also cause an electron to be ejected from cobalt.

D. Radio waves would also cause an electron to be ejected from cobalt.

Answer 1

Only blue light would also cause an electron to be ejected from cobalt.

Step-by-step explanation:

The photoelectric effect is a phenomenon that occurs when light shone onto a metal surface causes the ejection of electrons from that metal. Only blue light would also cause an electron to be ejected from cobalt. Only certain frequencies of light, which have energy equal to or greater than the threshold frequency, are able to cause the ejection of electrons.

Light of lower frequencies, such as red light, does not have enough energy to eject electrons from the metal surface of cobalt. Therefore, the most likely true statement is that only blue light would also cause an electron to be ejected from cobalt (Option A).