28-4 CHAPTER 28 Quantum Physics 9. In a photoelectric effect experiment, the wav

Question

28-4 CHAPTER 28 Quantum Physics 9. In a photoelectric effect experiment, the wavelength of the light is increased while the intensity of the light is held constant. As a result: i. There are more photoelectrons. ii. The photoelectrons are faster. Explain your choice iii. Both i and ii. iv. Neither i nor i 10. In a photoelectric effect experiment, the intensity of light is increased while the wavelength of light is held constant. As a result: i. There are more photoelectrons. ii. The photoelectrons are faster. Explain your choice. iii. Both i and ii. iv. Neither i nor ii.

Explanation / Answer

(9) On increasing intensity the no. of photoelectron will increase and due to increase in wavelenth , frequency of light decreases therefore energy of the light decreases.
hence the correct option will be i.
(10) In this case since wavelength is constant therfore the energy of light will remain same.
And due to increase in the intensity the no. of photoelectron will increase.
Therefore the correct option is i.

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