Class 12 Physics · Chapter 6 · Test 1
Photons and Photoelectric Effect
38 MCQs
38 questions · 35 min · 38 marks
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Sample questions
The first 5 of 38. Try each one, then tap to see the answer.
Question 1
Who suggested in 1901 that energy is radiated or absorbed in discrete packets called quanta?
- AMax Planck
- BAlbert Einstein
- CNiels Bohr
- DLouis de Broglie
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Answer: A
Max Planck proposed in 1901 that energy is radiated or absorbed in discrete packets called quanta.
Question 2
A discrete packet of energy is called a:
- AWavefront
- BQuantum
- CFringe
- DPhase
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Answer: B
Quanta is the plural of quantum which is a discrete packet of energy.
Question 3
The energy of a quantum of radiation of frequency f is:
- AE = h/f
- BE = f/h
- CE = hf
- DE = hf²
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Answer: C
The energy of each quantum is proportional to its frequency: E = hf.
Question 4
The value of Planck's constant is:
- A6.63 × 10^34 J s
- B1.6 × 10^-19 J s
- C3 × 10^-8 J s
- D6.63 × 10^-34 J s
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Answer: D
Planck's constant has the value 6.63 × 10^-34 J s.
Question 5
Max Planck received the Nobel Prize in physics for his discovery of energy quanta in the year:
- A1918
- B1921
- C1927
- D1932
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Answer: A
Planck received the Nobel Prize in physics in 1918.
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