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 |
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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 1.1×10-2 eV2 2.1×10-2 eV3 3.3×10-2 eV4 4.2×10-2 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/m22 0.398 W/m23  0.323 W/m24  0.401 W/m2

Subtopic:  Particle Nature of Light |
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What is the de Broglie wavelength of a bullet of mass 0.040 kg traveling at the speed of 1.0 km/s?

1 1.65×10-35 m2 1.05×10-35 m3 2.15×10-35 m4 2.11×10-35 m 

Subtopic:  De-broglie Wavelength |
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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 |
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The work function of cesium metal is 2.14 eV. When light of frequency 6 × 1014 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 |
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The photoelectric cut-off voltage in a certain experiment is 1.5 V. What is the maximum kinetic energy of photoelectrons emitted?


1 2.1×10-19 J2 1.7×10-19 J3 2.4×10-19 J4 1.1×10-19 J

Subtopic:  Photoelectric Effect: Experiment |
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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 4.801×10-19 J2 2.121×10-19 J3 5.043×10-19 J4 3.141×10-19 J

Subtopic:  Particle Nature of Light |
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The energy flux of sunlight reaching the surface of the earth is 1.388 × 103 W/m2. How many photons(nearly) per square meter are incident on the Earth per second? Assume an average wavelength of 550 nm.

(1) 3.84×1021

(2) 2.97×1021

(3) 4.12×1021

(4) 2.10×1021

Subtopic:  Particle Nature of Light |
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