Dual Nature of Matter and Radiation Practice Questions
JEE · Physics · 1452 free MCQs with instant results and detailed explanations.
1452
Total
317
Easy
664
Medium
471
Hard
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Topics in Dual Nature of Matter and Radiation
de Broglie Wavelength
334
Einstein's Equation
310
Photoelectric Effect
389
Davisson-Germer Experiment
419
Sample Questions from Dual Nature of Matter and Radiation
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.
The minimum frequency required to eject an electron from a metal surface.
B.
The maximum frequency that can eject electrons.
C.
The frequency at which the photoelectric current is maximum.
D.
The frequency that corresponds to the wavelength of the incident light.
Show Answer & Explanation
Correct Answer: A
The threshold frequency is the minimum frequency of incident light required for the photoelectric effect to occur, allowing electrons to be emitted from the metal surface.
Q2
Easy
Which of the following factors affects the stopping potential in the photoelectric effect?
A.
Intensity of incident light
B.
Frequency of incident light
C.
Type of metal used
D.
All of the above
Show Answer & Explanation
Correct Answer: B
The stopping potential is directly related to the frequency of the incident light and the work function of the metal, but not the intensity for a given frequency.
Q3
Easy
In the photoelectric effect, an increase in light intensity affects which of the following?
A.
The energy of emitted electrons
B.
The number of emitted electrons per unit time
C.
The speed of emitted electrons
D.
The work function of the metal
Show Answer & Explanation
Correct Answer: B
Increasing the intensity of light increases the number of photons hitting the surface, thereby increasing the number of emitted electrons, but does not affect their energy.
Q4
Medium
If the frequency of incident radiation on a metal surface is doubled, how does the maximum kinetic energy of the emitted electrons change?
A.
It doubles
B.
It remains the same
C.
It increases by 1 eV
D.
It quadruples
Show Answer & Explanation
Correct Answer: A
According to the photoelectric effect, the maximum kinetic energy of emitted electrons is directly proportional to the frequency of the incident radiation (KE = hf - W). Doubling the frequency (f) doubles the maximum kinetic energy.
Q5
Medium
A photoelectric experiment shows that the stopping potential required to stop emitted electrons is 5 V. If the work function of the metal is 3 eV, what is the frequency of the incident light?
A.
1.67 × 10^14 Hz
B.
3.33 × 10^14 Hz
C.
2.00 × 10^14 Hz
D.
6.67 × 10^14 Hz
Show Answer & Explanation
Correct Answer: B
The energy of the incident photons is given by E = W + eV, where eV is the energy corresponding to the stopping potential. Here, E = 3 eV + 5 eV = 8 eV. Using E = hf, we can find the frequency: f = E/h. Substituting the values gives f ≈ 3.33 × 10^14 Hz.
Q6
Medium
What is the threshold frequency for a metal if the work function is 4.5 eV?
A.
1.2 x 10^14 Hz
B.
3.0 x 10^14 Hz
C.
2.0 x 10^14 Hz
D.
5.0 x 10^14 Hz
Show Answer & Explanation
Correct Answer: A
Threshold frequency can be calculated using the formula f = W/h, where W is the work function (4.5 eV) converted to Joules.
Q7
Medium
If the intensity of light is doubled in a photoelectric experiment, what happens to the number of emitted electrons?
A.
Doubles
B.
Quadruples
C.
Remains the same
D.
Halves
Show Answer & Explanation
Correct Answer: A
Doubling the intensity of the light increases the number of photons impacting the surface, hence doubling the emitted electrons if frequency is above threshold.
Q8
Hard
Which of the following describes the photoelectric effect?
A.
Emission of electrons from a metal surface when irradiated with light.
B.
Absorption of photons by electrons in a gas.
C.
Reflection of light from a metal surface.
D.
Heat generation when light strikes a metal.
Show Answer & Explanation
Correct Answer: A
The photoelectric effect is specifically the emission of electrons from a surface when it is illuminated by light, demonstrating the particle nature of light.
Q9
Hard
In the photoelectric effect, what is the significance of the threshold frequency?
A.
It is the frequency below which no electrons are emitted.
B.
It is the maximum frequency at which electrons are emitted.
C.
It is the frequency at which the kinetic energy of emitted electrons is maximum.
D.
It has no significance in the phenomenon.
Show Answer & Explanation
Correct Answer: A
The threshold frequency is the minimum frequency of incident light required to emit electrons, below which no emission occurs.
Q10
Hard
If the intensity of light is doubled, while keeping the frequency constant in a photoelectric effect experiment, what happens to the number of emitted electrons?
A.
It doubles.
B.
It remains the same.
C.
It increases but not necessarily doubles.
D.
It decreases.
Show Answer & Explanation
Correct Answer: A
Doubling the intensity while keeping frequency constant increases the number of photons, leading to an increase in the number of emitted electrons.
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Dual Nature of Matter and Radiation — JEE Physics Practice Questions Online
This page contains 1452 practice MCQs for the chapter Dual Nature of Matter and Radiation in JEE Physics. The questions are organized by difficulty — 317 easy, 664 medium, 471 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 4 topics, giving you comprehensive coverage of the entire chapter.