# What will be the momentum, of the electrons accelerated through a potential difference of 56 V. 1. $$4.07 \times 10^{-25} \mathrm{~kg} \mathrm{~ms^{-1 }}$$ 2. $$4.04 \times 10^{-24} \mathrm{~kg} \mathrm{~ms}^{-1}$$ 3. $$4.07 \times 10^{-24} \mathrm{~kg} \mathrm{~ms^{-1 }}$$ 4. $$4.04 \times 10^{-25} \mathrm{~kg} \mathrm{~ms}^{-1}$$

Subtopic:  Electron Emission |
61%
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NEET 2023 - Target Batch - Aryan Raj Singh
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What is the de Broglie wavelength of an electron with the kinetic energy of $$120$$ eV?
1. $$0.123$$ nm
2. $$0.121$$ nm
3. $$0.112$$ nm
4. $$0.131$$ nm

Subtopic:  De-broglie Wavelength |
59%
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For what kinetic energy of a neutron will the associated de Broglie wavelength be
1.40 x ${10}^{-10}$ m?

1.$$1.1 \times 10^{-2}\ eV$$
2.$$2.1 \times 10^{-2}\ eV$$
3.$$3.3 \times 10^{-2}\ eV$$
4.$$4.2 \times 10^{-2}\ eV$$

Subtopic:  De-broglie Wavelength |
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What is the de Broglie wavelength of a nitrogen molecule in air at 300 K? Assume that the molecule is moving with the root-mean-square speed of molecules at this temperature. (Atomic mass of nitrogen = 14.0076 u)

1. 0.028 nm
2. 0.031 nm
3. 0.127 nm
4. 0.0139 nm

Subtopic:  De-broglie Wavelength |
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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 |
63%
From NCERT
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NEET 2023 - Target Batch - Aryan Raj Singh

What is the de Broglie wavelength of a bullet of mass $$0.040$$ kg traveling at the speed of $$1.0$$ km/s?
1. $$1.65\times10^{-35}$$ m
2. $$1.05\times10^{-35}$$ m
3. $$2.15\times10^{-35}$$ m
4. $$2.11\times10^{-35}$$ m

Subtopic:  De-broglie Wavelength |
78%
From NCERT
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An electron and a photon each have a wavelength of 1.00 nm. The momentum of the electron will be:

1. Greater than photon.
2. Equal to the photon.
3. Less than photon.
4. None of these.

Subtopic:  De-broglie Wavelength |
67%
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The work function of cesium metal is $$2.14$$ eV. When light of frequency $$6\times10^{14}$$ Hz is incident on the metal surface, photoemission of electrons occurs. What is the stopping potential of the metal?
1. $$0.212$$ V
2. $$0.345$$ V
3. $$0.127$$ V
4. $$0.311$$ V

Subtopic:  Einstein's Photoelectric Equation |
66%
From NCERT
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The photoelectric cut-off voltage in a certain experiment is $$1.5~\mathrm{V}$$. What is the maximum kinetic energy of photoelectrons emitted?
1. $$2.1 \times 10^{-19} \mathrm{~J}$$
2. $$1.7 \times 10^{-19} \mathrm{~J}$$
3. $$2.4 \times 10^{-19} \mathrm{~J}$$
4. $$1.1 \times 10^{-19}~\mathrm{J}$$

Subtopic:  Photoelectric Effect: Experiment |
76%
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NEET 2023 - Target Batch - Aryan Raj Singh

Monochromatic light of wavelength 632.8 nm is produced by a
helium-neon laser. The power emitted is 9.42 mW. The energy of each photon in the light beam is:

1.  $$4.801 \times 10^{-19}$$ J
2. $$2.121 \times 10^{-19}$$ J
3. $$5.043 \times 10^{-19}$$ J
4. $$3.141 \times 10^{-19}$$ J

Subtopic:  Particle Nature of Light |
55%
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