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Q. No.
If alpha, beta and gamma rays carry the same momentum, which has the longest wavelength?
1.
Alpha rays
2.
Beta rays
3.
Gamma rays
4.
None, all have same wavelength
Subtopic: De-broglie Wavelength |
66%
From NCERT
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The photoelectric effect is used by a photocell to convert:
| 1. | Change in the frequency of light into a change in electric voltage. |
| 2. | Change in the intensity of illumination into a change in photoelectric current. |
| 3. | Change in the intensity of illumination into a change in the work function of the photocathode. |
| 4. | Change in the frequency of light into a change in the electric current. |
Subtopic: Photoelectric Effect: Experiment |
64%
From NCERT
AIPMT - 2006
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A \(200\) W sodium street lamp emits yellow light of wavelength \(0.6\) . If it is \(25\%\) efficient in converting electrical energy to light, how many photons of yellow light does it emit per second?
1. \(1.5\times 10^{20}\)
2. \(6\times 10^{18}\)
3. \(62\times 10^{20}\)
4. \(3\times 10^{19}\)
1. \(1.5\times 10^{20}\)
2. \(6\times 10^{18}\)
3. \(62\times 10^{20}\)
4. \(3\times 10^{19}\)
Subtopic: Particle Nature of Light |
70%
From NCERT
AIPMT - 2012
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In the photoelectric emission process from a metal of work function \(1.8\) eV, the kinetic energy of most energetic electrons is \(0.5\) eV. What is the corresponding stopping potential?
1. \(1.3\) V
2. \(0.5\) V
3. \(2.3\) V
4. \(1.8\) V
1. \(1.3\) V
2. \(0.5\) V
3. \(2.3\) V
4. \(1.8\) V
Subtopic: Einstein's Photoelectric Equation |
74%
From NCERT
AIPMT - 2011
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Electrons used in an electron microscope are accelerated by a voltage of \(25\) kV. If the voltage were increased to \(100\) kV, then the de-Broglie wavelength associated with the electrons would:
| 1. | decrease by \(2\) times |
| 2. | decrease by \(4\) times |
| 3. | increase by \(4\) times |
| 4. | increase by \(2\) times |
Subtopic: De-broglie Wavelength |
78%
From NCERT
AIPMT - 2011
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A source \(S_1\) is producing, \(10^{15}\) photons per sec of wavelength \(5000~\mathring{A}\). Another source \(S_2\) is producing \(1.02\times 10^{15}\) photons per second of wavelength \(5100~\mathring{A}\). Then the ratio of the power of \(S_2\) to the power of \(S_1\) is equal to:
| 1. | \(1.00\) | 2. | \(1.02\) |
| 3. | \(1.04\) | 4. | \(0.98\) |
Subtopic: Particle Nature of Light |
74%
From NCERT
AIPMT - 2010
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Monochromatic light of frequency \(6.0\times 10^{14}\) Hz is produced by a laser. The power emitted is \(2\times 10^{-3}\) W. What will be the average number of photons emitted by the source per second?
1. \(5\times 10^{15}\)
2. \(5\times 10^{16}\)
3. \(5\times 10^{17}\)
4. \(5\times 10^{14}\)
1. \(5\times 10^{15}\)
2. \(5\times 10^{16}\)
3. \(5\times 10^{17}\)
4. \(5\times 10^{14}\)
Subtopic: Particle Nature of Light |
71%
From NCERT
AIPMT - 2007
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When photons of energy \(h\nu\) fall on an aluminium plate (of work function \(E_0\)), photoelectrons of maximum kinetic energy \(K\) are ejected.
If the frequency of the radiation is doubled, the maximum kinetic energy of the ejected photoelectrons will be:
1. \(K+ E_0\)
2. \(2K\)
3. \(K\)
4. \(K + h\nu\)
Subtopic: Einstein's Photoelectric Equation |
61%
From NCERT
AIPMT - 2006
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In an experiment of the photoelectric effect, the wavelength of incident radiation is . The wavelength of incident radiation is reduced to rd of initial value and the maximum kinetic energy of photoelectron is observed to be n times the previous value. What will be the threshold wavelength for the metal plate?
| 1. | \(\dfrac{n-1}{n-3} \lambda \) | 2. | \(\dfrac{n}{n-3} \lambda \) |
| 3. | \(\dfrac{n-3}{n-1} \lambda \) | 4. | \(\dfrac{n+1}{n-3} \lambda\) |
Subtopic: Einstein's Photoelectric Equation |
72%
From NCERT
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The de-Broglie wavelength of a particle accelerated by a \(150\) volt potential difference is \(10^{-10}\) m. What will its wavelength be if it is accelerated by a \(600\) volt potential difference?
1. \(0.25~\mathring{A}\)
2. \(0.5~\mathring{A}\)
3. \(1.5~\mathring{A}\)
4. \(2~\mathring{A}\)
1. \(0.25~\mathring{A}\)
2. \(0.5~\mathring{A}\)
3. \(1.5~\mathring{A}\)
4. \(2~\mathring{A}\)
Subtopic: De-broglie Wavelength |
77%
From NCERT
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