You are doing a physics experiment on the photoelectric effect. You shine a gree

Question

You are doing a physics experiment on the photoelectric effect. You shine a green laser (wavelength = 632 nm) at a sample of metal, but you discover that no electrons are ejected. You decide the best way to get electrons to come off the metal is to change lasers to one emitting red light (700 nm). Which represents a likely result?

A) Electrons will begin to be removed from the metal, because increasing the wavelength of the light increases the number of photons of the light

B) No electrons will be removed from the metal, because increasing the wavelength just increases the number of photons emitted

C) Electrons will begin to be removed from the metal, because increasing the wavelength increases the energy of light

D) No electrons will be removed from the metal because frequency is decreased, which decreases the energy of light

Explanation / Answer

Ans B) No electrons will be removed from the metal because increasing the wavelength just incraeses the number of photons emitted.

Increasing the wavelength of light decreases its frequency. The number of photons increases on increasing the wavelength , but the energy of the photon will decrease , which causes lesser probability of producing an emitted electron.

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