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JEE PHYSICS MCQ: DUAL NATURE OF RADIATION AND MATTER
1
Medium
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Understanding
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Assertion: The number of photons emitted per second by a point source of light is directly proportional to the power of the source and inversely proportional to the energy of each photon.
Reason: The equation relates the number of photons emitted per second to the power of the source , the wavelength of light emitted , and fundamental physical constants ( and ). This equation shows that increasing the power of the source or decreasing the energy of each photon will result in an increase in the number of photons emitted per second.
Reason: The equation relates the number of photons emitted per second to the power of the source , the wavelength of light emitted , and fundamental physical constants ( and ). This equation shows that increasing the power of the source or decreasing the energy of each photon will result in an increase in the number of photons emitted per second.
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Correct option: A
Both Assertion and Reason are true, and Reason is the correct explanation for Assertion
Option A (Both Assertion and Reason are true, and Reason is the correct explanation for Assertion) is correct because the number of photons emitted per second is directly proportional to the power and inversely proportional to the energy of each photon, as described by the given equation.
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(i) the energy of the incident photons
(ii) the maximum kinetic energy of the photoelectrons emitted. An electron is accelerated by a potential difference of V volt to acquire kinetic energy equal to maximum kinetic energy of ejected photoelectron from a metal of work function 3.2 eV, using a light of wavelength Value of V is Two monochromatic beams and of equal intensity , hit a screen. The number of photons hitting the screen by beam is twice that by beam . Then, what can inference you about their frequencies? A 5 W source emits monochromatic light of wavelength . When placed 0.5 m away, it liberates photoelectrons from a photosensitive metallic surface. When the source is moved to a distance of 1.0m, the number of photoelectrons liberated will be reduced by a factor of