Compared to a photon of high energy, a lower energy photon has......longer wavel

Question

Compared to a photon of high energy, a lower energy photon has......longer wavelength and lower frequency....longer wavelength and higher frequency....shorter wavelength and higher frequency....shorter wavelength and lower frequency. A scientist tests the Photoelectric Effect by shining two, equal energy photons at a sheet of tungsten metal. Tungsten requires 1.11 Times 10^-20 J of energy to remove an electron. The two, equal energy photons have a total energy of 3.02 Times 10^-20 J. Which of the following is TRUE? No electrons will be emitted because the energy of each photon is less than the binding energy. No electrons will be emitted because the total energy is less than the binding energy. One electron will be emitted because the total energy is greater than the binding energy of one electron. Two electrons will be emitted because the total energy is greater than the binding energy. Two electrons will be emitted because the energy of each photon is greater than the binding energy.

Explanation / Answer

14) Energy E = hv v= frequency

E = hc/ wavelength

Hence,

energy of photon is directly proportional to frequency.

energy of photon is inversly proportional to wavelength.

Therefore,

lower energy photon has longer wavelength and lower frequency.

15) C

  One electron will be emitted because total energy is greater than binding energy of one electron.

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