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CBSE - Class 12 > Physics > Dual Nature of Radiation and Matter Worksheets

Free CBSE - Class 12 Physics - Dual Nature of Radiation and Matter worksheets

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1.
Monochromatic light of wavelength 632.8 nm is produced by a helium-neon laser. The power emitted is 9.42 mW. How fast does a hydrogen atom have to travel in order to have the same momentum as that of the photon?
2.
In an experiment on photoelectric effect, the slope of the cut-off voltage versus frequency of incident light is found to be (4.12 \times 10^{-15}) V s. Calculate the value of Planck’s constant.
3.
The threshold frequency for a certain metal is (3.3 \times 10^{14}) Hz. If light of frequency (8.2 \times 10^{14}) Hz is incident on the metal, predict the cut-off voltage for the photoelectric emission.
4.
The work function for a certain metal is 4.2 eV. Will this metal give photoelectric emission for incident radiation of wavelength 330 nm?
5.
Light of frequency (7.21 \times 10^{14}) Hz is incident on a metal surface. Electrons with a maximum speed of (6.0 \times 10^{5}) m/s are ejected from the surface. What is the threshold frequency for photoemission of electrons?
6.
Light of wavelength 488 nm is produced by an argon laser which is used in the photoelectric effect. When light from this spectral line is incident on the emitter, the stopping (cut-off) potential of photoelectrons is 0.38 V. Find the work function of the material from which the emitter is made.
7.
What is the de Broglie wavelength of a bullet of mass 0.040 kg travelling at the speed of 1.0 km/s?
8.
What is the de Broglie wavelength of a ball of mass 0.060 kg moving at a speed of 1.0 m/s?
9.
What is the de Broglie wavelength of a dust particle of mass (1.0 \times 10^{-9}) kg drifting with a speed of 2.2 m/s ?
10.
Show that the wavelength of electromagnetic radiation is equal to the de Broglie wavelength of its quantum (photon).
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Chapters in CBSE - Class 12 Physics

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