Select Chapter Topics:
Q. No.Given below are two statements:
| Assertion (A): | The work function of aluminium is \(4.2~\text{eV}\). Emission of electrons will not be possible if two photons, each of energy \(2.5~\text{eV}\), strike an electron of aluminium. |
| Reason (R): | For photoelectric emission, the energy of each photon should be greater than the work function of aluminium. |
| 1. | Both (A) and (R) are True and (R) is the correct explanation of (A). |
| 2. | Both (A) and (R) are True but (R) is not the correct explanation of (A). |
| 3. | (A) is True but (R) is False. |
| 4. | Both (A) and (R) are False. |
Subtopic: Photoelectric Effect: Experiment |
86%
From NCERT
To view explanation, please take trial in the course.
NEET 2025 - Target Batch
Hints
To view explanation, please take trial in the course.
NEET 2025 - Target Batch
\(A\) and \(B\) are two metals with threshold frequencies \(1.8\times 10^{14}\ \) Hz and \(2.2\times 10^{14}\ \) Hz. Two identical photons of energy \(0.825\) eV each are incident on them. Then, photoelectrons are emitted in: (Take \(h=6.6\times 10^{-34}\ \) J-s)
1. \(B\) only
2. \(A\) only
3. neither \(A\) nor \(B\)
4. both \(A\) and \(B\)
1. \(B\) only
2. \(A\) only
3. neither \(A\) nor \(B\)
4. both \(A\) and \(B\)
Subtopic: Photoelectric Effect: Experiment |
From NCERT
Please attempt this question first.
Hints
Please attempt this question first.
A photosensitive plate has a threshold frequency which is in the range of blue light. It can also exhibit a photoelectric effect, if illuminated by:
1. orange light
2. yellow light
3. green light
4. violet light
1. orange light
2. yellow light
3. green light
4. violet light
Subtopic: Photoelectric Effect: Experiment |
85%
From NCERT
Please attempt this question first.
Hints
Please attempt this question first.
About \(5\)% of the power of a \(100\) W light bulb is converted to visible radiation. What is the average intensity of visible radiation at a distance of \(1\) m from the bulb?
1. \(0.472\) W/m2
2. \(0.398\) W/m2
3. \(0.323\) W/m2
4. \(0.401\) W/m2
Subtopic: Particle Nature of Light |
62%
From NCERT
To view explanation, please take trial in the course.
NEET 2025 - Target Batch
Hints
Links
To view explanation, please take trial in the course.
NEET 2025 - Target Batch
Subtopic: Photoelectric Effect: Experiment |
83%
From NCERT
Please attempt this question first.
Hints
Please attempt this question first.
If the intensity of radiation incident on a photocell is increased four times keeping frequency constant, then the number of photoelectrons and energy of photoelectrons emitted become:
| 1. | four times, doubled |
| 2. | doubled, remains unchanged |
| 3. | remains unchanged, doubled |
| 4. | four times, remains unchanged |
Subtopic: Electron Emission |
85%
From NCERT
Please attempt this question first.
Hints
Please attempt this question first.
When the intensity of a light source is increased,
| (a) | the number of photons emitted by the source in unit time increases. |
| (b) | the total energy of the photons emitted per unit time increases. |
| (c) | more energetic photons are emitted. |
| (d) | faster photons are emitted. |
Choose the correct option:
| 1. | (a), (b) | 2. | (b), (c) |
| 3. | (c), (d) | 4. | (a), (d) |
Subtopic: Photoelectric Effect: Experiment |
From NCERT
To view explanation, please take trial in the course.
NEET 2025 - Target Batch
Hints
To view explanation, please take trial in the course.
NEET 2025 - Target Batch
A photo-cell is illuminated by a source of light, which is placed at a distance \(d\) from the cell. If the distance becomes \(\dfrac{d}{2}\), then the number of electrons emitted per second will be:
1. same
2. four times
3. two times
4. one-fourth
Subtopic: Photoelectric Effect: Experiment |
70%
From NCERT
AIPMT - 2001
To view explanation, please take trial in the course.
NEET 2025 - Target Batch
Hints
To view explanation, please take trial in the course.
NEET 2025 - Target Batch
A point source of light is used in a photoelectric effect. If the source is removed farther from the emitting metal, the stopping potential:
| 1. | will increase. |
| 2. | will decrease. |
| 3. | will remain constant. |
| 4. | will either increase or decrease. |
Subtopic: Photoelectric Effect: Experiment |
84%
From NCERT
To view explanation, please take trial in the course.
NEET 2025 - Target Batch
Hints
To view explanation, please take trial in the course.
NEET 2025 - Target Batch
If stopping potential \(V_{0}\) is plotted versus frequency \(\nu\) in an experiment of the photoelectric effect, the graph as shown in the diagram is obtained. Then: (e is an electronic charge)
| 1. | Planck's constant = \(\dfrac{b}{a}\) |
| 2. | Planck's constant = \(\dfrac{eb}{a}\) |
| 3. | Planck's constant = \(\dfrac{a}{b}\) |
| 4. | Planck's constant = \(\dfrac{ea}{b}\) |
Subtopic: Photoelectric Effect: Experiment |
74%
From NCERT
To view explanation, please take trial in the course.
NEET 2025 - Target Batch
Hints
To view explanation, please take trial in the course.
NEET 2025 - Target Batch
Select Chapter Topics:
© 2024 GoodEd Technologies Pvt. Ltd.