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12th Maharashtra Board
IMPORTANT
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A photocell is used to automatically switch on the street lights in the evening when the sunlight is low in intensity. Thus it has to work with visible light. The material of the cathode of the photo cell is

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Important Questions on Dual Nature of Radiation and Matter

MEDIUM
12th Maharashtra Board
IMPORTANT
Physics Standard 12>Chapter 14 - Dual Nature of Radiation and Matter>Exercises>Q 1
Polychromatic (containing many different frequencies) radiation is used in an experiment on photoelectric effect. The stopping potential.
MEDIUM
12th Maharashtra Board
IMPORTANT
Physics Standard 12>Chapter 14 - Dual Nature of Radiation and Matter>Exercises>Q 1
An electron, a proton, an α-particle and a hydrogen atom are moving with the same kinetic energy. The associated de Broglie wavelength will be longest for
MEDIUM
12th Maharashtra Board
IMPORTANT
Physics Standard 12>Chapter 14 - Dual Nature of Radiation and Matter>Exercises>Q 1
If NRed and NBlue are the number of photons emitted by the respective sources of equal power and equal dimensions in unit time, then
MEDIUM
12th Maharashtra Board
IMPORTANT
Physics Standard 12>Chapter 14 - Dual Nature of Radiation and Matter>Exercises>Q 1
The equation E=pc is valid
MEDIUM
12th Maharashtra Board
IMPORTANT
Physics Standard 12>Chapter 14 - Dual Nature of Radiation and Matter>Exercises>Q 3
Explain the inverse linear dependence of stopping potential on the incident wavelength in a photoelectric effect experiment.
MEDIUM
12th Maharashtra Board
IMPORTANT
Physics Standard 12>Chapter 14 - Dual Nature of Radiation and Matter>Exercises>Q 4
It is observed in an experiment on the photoelectric effect that an increase in the intensity of the incident radiation does not change the maximum kinetic energy of the electrons. Where does the extra energy of the incident radiation go? Is it lost? State your answer with explanatory reasoning.
MEDIUM
12th Maharashtra Board
IMPORTANT
Physics Standard 12>Chapter 14 - Dual Nature of Radiation and Matter>Exercises>Q 5
Explain what do you understand by the de Broglie wavelength of an electron. Will an electron at rest have an associated de Broglie wavelength? Justify your answer.
MEDIUM
12th Maharashtra Board
IMPORTANT
Physics Standard 12>Chapter 14 - Dual Nature of Radiation and Matter>Exercises>Q 6
State the importance of Davisson and Germer experiment.