Dual Nature of Radiation and Matter
Telangana Open School (TOSS) · Class 12 · Physics
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Quick Quiz: Dual Nature of Radiation and Matter
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What is the phenomenon called when electrons are emitted from a metal surface when light of suitable frequency falls on it?
Who discovered the photoelectric effect?
In thermionic emission, electrons gain energy from:
The minimum energy required for an electron to escape from a metal surface is called:
Sample Questions
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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