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Q. No.A monochromatic source of light emits \(50~\text{W}\) at a wavelength of \(400~\text{nm}.\) The number of photons emitted per second is approximately (take \({hc} = 1240~\text{eV-nm}\)):
1. \(10^{20}\)
2. \(10^{25}\)
3. \(10^{30}\)
4. \(10^{40}\)
1. \(10^{20}\)
2. \(10^{25}\)
3. \(10^{30}\)
4. \(10^{40}\)
Subtopic: Â Particle Nature of Light |
 80%
From NCERT
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The work function of cesium is \(2.14 ~\text{eV}.\) The threshold frequency for cesium is:
| 1. | \(5.03\times10^{12}~\text{Hz}\) | 2. | \(6.12\times10^{14}~\text{Hz}\) |
| 3. | \(5.16\times10^{14}~\text{Hz}\) | 4. | \(6.51\times10^{12}~\text{Hz}\) |
Subtopic: Â Particle Nature of Light |
 73%
From NCERT
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Which of the following demonstrates the particle nature of light?
| 1. | photoelectric effect | 2. | interference |
| 3. | refraction | 4. | polarisation |
Subtopic: Â Particle Nature of Light |
 90%
From NCERT
AIPMT - 2001
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Two photons have:
| 1. | equal wavelengths have equal linear momenta. |
| 2. | equal energies have equal linear momenta. |
| 3. | equal frequencies have equal linear momenta. |
| 4. | equal linear momenta have equal wavelengths. |
Subtopic: Â Particle Nature of Light |
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Let \(n_r\) and \(n_b\) be respectively the number of photons emitted by a red bulb and a blue bulb of equal power in a given time. Then:
| 1. | \(n_r=n_b\) |
| 2. | \(n_r<n_b\) |
| 3. | \(n_r>n_b\) |
| 4. | the information is insufficient to get a relation between \(n_r\) and \(n_b\) |
Subtopic: Â Particle Nature of Light |
 68%
From NCERT
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Q. No.
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