Dual Nature of Radiation and Matter — Important Questions
Telangana Open School (TOSS) · Class 12 · Physics
54 important questions from Dual Nature of Radiation and Matter for Telangana Open School (TOSS) Class 12 Physics, with answers.
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Important Questions from Dual Nature of Radiation and Matter
The photoelectric effect is instantaneous. What does this mean?
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Electrons are emitted immediately
Photoelectric emission occurs almost instantly when light hits the surface, with a time lag of about 10⁻⁹ seconds.
Which of the following metals has the lowest work function?
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Sodium
From the table, sodium has a work function of 2.5 eV, which is the lowest among the listed metals.
The stopping potential is the minimum retarding potential at which:
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Current becomes zero
Stopping potential is the voltage at which no photoelectrons reach the collector, so the current drops to zero.
Einstein proposed that light consists of discrete packets of energy called:
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Photons
Einstein introduced the concept of photons to explain the photoelectric effect.
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