The pictured graph shows the relationship between the maximum kinetic energy of electrons flying off the surface of a metal versus the frequency of light striking the metal surface as part of the photoelectric effect.According to this graph, what will happen when light of frequency 7 × 1014 Hz strikes the metal surface?

Engineering

Physics

Photoelectric Effect Einsteins Equation

Question

The pictured graph shows the relationship between the maximum kinetic energy of electrons flying off the surface of a metal versus the frequency of light striking the metal surface as part of the photoelectric effect.
According to this graph, what will happen when light of frequency 7 × 10¹⁴ Hz strikes the metal surface?

Electrons will be emitted with negative kinetic energy

A small number of electrons will be emitted with a small amounts of kinetic energy

No electrons will be emitted

The light will only knock loose electrons off the surface of the metal

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From figure, the threshold frequency of the metal v_th = 10 × 10¹⁴ Hz

When light of frequency greater than the threshold frequency of the metal falls on the surface of metal, only then the photoelectrons are emitted. As the light used has frequency less that the threshold frequency of the metal, thus no electrons are emitted.

Hence option C is correct.