Question

In an experiment searching for the photoelectric effect, an incident beam of green light produced no ejected electrons from a metal. In order to eject electrons, the experimenter should?

A.

increase the brightness of the light.

B.

try blue light.

C.

try yellow light.

D.

give up on that particular metal.

E.

decrease the brightness of the light.

Answer 1

If no electron is ejected from the metal that means that the frequency of green light is below the threshold frequency of the metal. So no matter how much brightness is increased or decreased, the electron will not come out.

Higher the frequency of light higher will be it's energy.so according to this among three light blue yellow and green

Blue have highest frequency then green then yellow.

So frequency order is : blue > green > yellow

Energy order : blue > green > yellow .

So blue light is more energetic than green light so it must be given a try to eject the electron.

Yellow light is less energetic than green so it will have no chance of ejecting electron.

Answer : option B