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प्रश्न
Name two sources of infrared radiation.
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उत्तर
(i) Infrared lamp, (ii) Fire.
संबंधित प्रश्न
What physical quantity is the same for X-rays of wavelength 10−10 m, red light of wavelength 6800 Å and radiowaves of wavelength 500 m?
Give a reason for the following:
Long-distance radio broadcasts use short-wave bands. Why?
If the earth did not have an atmosphere, would its average surface temperature be higher or lower than what it is now?
Give the range of wavelength of the electromagnetic waves visible to us.
Name two electromagnetic waves of frequency smaller than that of violet light. State one use of each.
Name the waves produced by the changes in the nucleus of an atom.
The wavelengths of Kα and Lα X-rays of a material are 21.3 pm and 141 pm respectively. Find the wavelength of Kβ X-ray of the material.
(Use Planck constant h = 6.63 × 10-34 Js= 4.14 × 10-15 eVs, speed of light c = 3 × 108 m/s.)
The distance between the cathode (filament) and the target in an X-ray tube is 1.5 m. If the cutoff wavelength is 30 pm, find the electric field between the cathode and the target.
(Use Planck constant h = 6.63 × 10-34 Js= 4.14 × 10-15 eVs, speed of light c = 3 × 108 m/s.)
An e.m. wave exerts pressure on the surface on which it is incident. Justify.
