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प्रश्न
Name two sources of ultraviolet radiation.
State any one source of ultraviolet radiation.
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उत्तर
- Sun
- Electric arc
- Mercury lamp
- Halogen lamp
Notes
Students should refer to the answer according to their questions.
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संबंधित प्रश्न
The terminology of different parts of the electromagnetic spectrum is given in the text. Use the formula E = hv (for energy of a quantum of radiation: photon) and obtain the photon energy in units of eV for different parts of the electromagnetic spectrum. In what way are the different scales of photon energies that you obtain related to the sources of electromagnetic radiation?
If the earth did not have an atmosphere, would its average surface temperature be higher or lower than what it is now?
What is the range of the wavelength of the following electromagnetic waves?
(a) Visible.
What is the range of the wavelength of the following electromagnetic waves?
(a) Infrared.
Name the region beyond the violet end of the spectrum called.
Name two electromagnetic waves of frequency smaller than that of violet light. State one use of each.
Is it possible that in a Coolidge tube characteristic Lα X-rays are emitted but not Kα X-rays?
Can a hydrogen atom emit characteristic X-rays?
The potential difference applied to an X-ray tube is increased. As a result, in the emitted radiation,
(a) the intensity increases
(b) the minimum wavelength increases
(c) the intensity remains unchanged
(d) the minimum wavelength decreases.
Find the cutoff wavelength for the continuous X-rays coming from an X-ray tube operating at 30 kV.
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Write the range of the wavelength of the following electromagnetic radiations:
(a) Infrared rays
(b) Ultraviolet rays
(c) γ -rays
Write one use of each of the above.
Name the scientist who discovered Infra-red waves
Arrange the following electromagnetic waves in increasing order of their frequencies (i.e. begin with the lowest frequency):
Visible light, y rays, X rays, microwaves, radio waves, infrared radiations, and ultraviolet radiation.
State three properties of ultra-violet radiation similar to visible light.
Answer briefly.
Does an ordinary electric lamp emit EM waves?
Answer briefly.
Give two uses of ultraviolet rays.
Answer briefly.
Give two uses of radio waves.
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