The Photoelectric Effect Lab 10 Prelab Questions : Predictions If the light shining on the metal...

The Photoelectric Effect Lab 10

Prelab Questions : Predictions

If the light shining on the metal becomes brighter, will the kinetic energy of the emitted electrons increase?

If the light shining on the metal becomes brighter, will the number of electrons being emitted per second (the photo-current) increase?

If the frequency of the light shining on the metal is increased, will the number of electrons being emitted per second (the photo-current) increase?

If the frequency of the light shining on the metal is increased, will the kinetic energy of electrons being emitted increase?

Will all colors (frequencies) of light cause electrons to be emitted by the metal? What is the condition on wavelength for Potassium that light should cause electrons to be ejected?

If light with the same frequency and same power shines on two different metals with different work functions, will both metals emit electrons?
1. Will these electrons have the same kinetic energy?
2. Will the photo-current be larger for the metal with the smaller work function?

Solutions

Expert Solution

✓If the light shining on the metal becomes brighter,the kinetic energy of the emitted electrons will not increase as kinetic energy is independent of the intensity of incident light.

✓If the light shining on the metal becomes brighter, the number of electrons being emitted per second (the photo-current) will increase as intensity of incident light is directly related to the number of electrons ejected .

✓ If the frequency of the light shining on the metal is increased, the number of electrons being emitted per second (the photo-current) will not increase as frequency and number of electrons ejected are independent of each other

✓If the frequency of the light shining on the metal is increased, the kinetic energy of electrons being emitted increase

No all colours will not cause the electrons to be emitted from metal because different colours have different wavelengths and thus different energies . Only the colours having energy greater than the work function of metal will cause the electrons to eject

genius_generous answered 1 month ago

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