Photoelectric Effect — Flashcards
ICSE · Class 12 · Physics
30 flashcards for Photoelectric Effect (ICSE Class 12 Physics) to test yourself on key terms and facts. Sample: "What is photoelectric effect?"
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What is photoelectric effect?
Answer
Photoelectric effect is the emission of electrons from metals under the effect of light. The emitted electrons are called photoelectrons, and the current produced is called photoelectric current.
Why is short-wavelength light more effective in photoelectric effect?
Answer
Short-wavelength light has higher frequency and therefore higher photon energy. A photon must supply enough energy to free an electron from the metal. Light of short wavelength is therefore more effec…
What did Hertz observe in 1887 about ultraviolet light and a discharge tube?
Answer
Hertz observed that when ultraviolet rays fell on the negative plate of an electric discharge tube, the electric discharge became easier. This was an early observation of the photoelectric effect.
What did Hallwachs observe with two zinc plates in a vacuum bulb?
Answer
Hallwachs found that when ultraviolet rays fell on the negative plate, current flowed in the circuit immediately. When the rays were stopped, the current stopped. When ultraviolet rays fell on the pos…
Why does current flow only when ultraviolet light falls on the negative plate in Hallwachs' arrangement?
Answer
The electrons emitted from the negative plate are attracted by the positive plate, so the circuit is completed and current flows. If light falls on the positive plate, the emitted electrons do not rea…
A photocell receives light of fixed frequency. What happens to photocurrent when intensity is doubled?
Answer
Photocurrent is directly proportional to intensity of incident light. So, if intensity is doubled, the maximum photoelectric current is doubled. The frequency is unchanged, so the maximum kinetic ener…
A metal surface is illuminated with light and the stopping potential is 2.0 V. What is the maximum kinetic energy of the photoelectrons?
Answer
Given: stopping potential V0 = 2.0 V Formula: Ek = eV0 Step 1: Ek = 2.0 eV Step 2: Ek = 2.0 x 1.6 x 10^-19 J Step 3: Ek = 3.2 x 10^-19 J Answer: Maximum kinetic energy = 3.2 x 10^-19 J…
What is stopping potential or cut-off potential?
Answer
The negative potential of P2 relative to P1 at which the photoelectric current becomes zero is called stopping potential or cut-off potential. It is a measure of the maximum kinetic energy of the phot…
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