Dual Nature of Radiation and Matter Practice Questions
Class 12 · Physics · 2370 free MCQs with instant results and detailed explanations.
2370
Total
820
Easy
1148
Medium
402
Hard
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Topics in Dual Nature of Radiation and Matter
Davisson-Germer Experiment
1067
Photoelectric Effect
827
De Broglie Wavelength
476
Sample Questions from Dual Nature of Radiation and Matter
Here are 10 sample questions. Start a quiz to get randomized questions with scoring.
Q1
Easy
What is the threshold frequency in the photoelectric effect?
A.
Minimum frequency for photoemission
B.
Maximum frequency for photoemission
C.
Frequency at which energy is maximum
D.
Frequency where light is absorbed
Show Answer & Explanation
Correct Answer: A
The threshold frequency is the minimum frequency of incident light required to cause photoemission of electrons.
Q2
Easy
Which of the following is a characteristic of the photoelectric effect?
A.
Electron emission occurs without light
B.
Emission depends on intensity only
C.
Emission depends on frequency of light
D.
All metals emit electrons at all frequencies
Show Answer & Explanation
Correct Answer: C
The photoelectric effect shows that the emission of electrons depends on the light frequency, not just intensity.
Q3
Easy
If the intensity of light is doubled, what happens to the photoelectric current?
A.
It halves
B.
It doubles
C.
It remains the same
D.
It becomes zero
Show Answer & Explanation
Correct Answer: B
Doubling the intensity increases the number of photons, thus increasing the photoelectric current proportionally.
Q4
Medium
What is the minimum frequency of light required to emit electrons from a metal surface known as?
A.
Threshold frequency
B.
Resonance frequency
C.
Cut-off frequency
D.
Critical frequency
Show Answer & Explanation
Correct Answer: A
Threshold frequency is the minimum frequency that can eject electrons from a material's surface.
Q5
Medium
If the wavelength of incident light is halved, what happens to the energy of the photons?
A.
It doubles
B.
It halves
C.
It remains the same
D.
It quadruples
Show Answer & Explanation
Correct Answer: A
Photon energy is inversely proportional to wavelength; halving the wavelength doubles the energy.
Q6
Medium
In the photoelectric effect experiment, what role does the anode play?
A.
It emits electrons
B.
It collects emitted electrons
C.
It provides the illuminating light
D.
It ionizes the metal
Show Answer & Explanation
Correct Answer: B
The anode collects the emitted electrons, creating a measurable current.
Q7
Medium
What phenomenon is observed when light falls on a metal surface and causes electron emission?
A.
Photonic emission
B.
Photoelectric effect
C.
Photonic absorption
D.
Photoionization
Show Answer & Explanation
Correct Answer: B
The photoelectric effect describes the emission of electrons upon light incidence.
Q8
Hard
Which of the following conditions is essential for the photoelectric effect to take place?
A.
The incident light must be monochromatic.
B.
The incident light must have a frequency above the threshold frequency.
C.
The material must be a semiconductor.
D.
The light must be polarized.
Show Answer & Explanation
Correct Answer: B
The photoelectric effect occurs only when the frequency of the incident light is greater than the threshold frequency of the material, allowing electrons to be emitted.
Q9
Hard
In the context of the photoelectric effect, which of the following statements is incorrect?
A.
Increasing the intensity of light increases the number of emitted electrons.
B.
Increasing the frequency of light increases the kinetic energy of emitted electrons.
C.
The photoelectric effect is a wave phenomenon.
D.
Different metals have different threshold frequencies.
Show Answer & Explanation
Correct Answer: C
The photoelectric effect is a quantum phenomenon, not a wave phenomenon, as it involves the interaction of photons with electrons.
Q10
Hard
A scientist observes that light of wavelength 300 nm causes photoelectron emission from a certain metal. What can be deduced about that metal?
A.
The metal has a high work function.
B.
The wavelength is below the threshold wavelength.
C.
The metal does not emit photoelectrons.
D.
The metal has a low threshold frequency.
Show Answer & Explanation
Correct Answer: B
Since light of wavelength 300 nm causes emission, it means the energy corresponding to this wavelength is greater than the work function, indicating that the wavelength is below the threshold wavelength.
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Dual Nature of Radiation and Matter — Class 12 Physics Practice Questions Online
This page contains 2370 practice MCQs for the chapter Dual Nature of Radiation and Matter in Class 12 Physics. The questions are organized by difficulty — 820 easy, 1148 medium, 402 hard — so you can choose the right level for your preparation.
Every question includes a detailed explanation to help you understand the concept, not just memorize answers. Take a timed quiz to simulate exam conditions, or practice at your own pace with no time limit. This chapter covers 3 topics, giving you comprehensive coverage of the entire chapter.