JEE Main 2010 Physics question
Statement-1 : When ultraviolet light is incident on a photocell, its stopping potential is and the maximum kinetic energy of the photoelectrons is . When the ultraviolet light is replaced by X− rays, both and increase. Statement-2 : Photoelectrons are emitted with speeds ranging from zero to a maximum value because of the range of frequencies present in the incident light. Of the four choices given after the statements, choose the one that best describes the two statements.
Answer: (4)
Solution
X-rays have higher frequency, so and both increase — Statement 1 is true. The spread of speeds arises even for monochromatic
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