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प्रश्न
What are ultraviolet radiations?
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उत्तर
Ultraviolet radiations are electromagnetic waves that occur right after the violet end of the spectrum and have wavelengths shorter than the violet portion of the visible spectrum.
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संबंधित प्रश्न
Give one use of ultraviolet radiation.
How are X-rays produced?
Find the energy, the frequency and the momentum of an X-ray photon of wavelength 0.10 nm.
(Use Planck constant h = 4.14 × 10-15 eVs, speed of light c = 3 × 108 m/s.)
A free atom of iron emits Kα X-rays of energy 6.4 keV. Calculate the recoil kinetic energy of the atom. Mass of an iron atom = 9.3 × 10−26 kg.
(Use Planck constant h = 6.63 × 10-34 Js= 4.14 × 10-15 eVs, speed of light c = 3 × 108 m/s.)
Name the radiation of the electromagnetic spectrum which is used for the following:
For taking photographs of the sky during the night and foggy conditions . Give the frequency range
Name any two electromagnetic waves which have a frequency higher than that of violet light. State one use of each.
If the Earth did not have atmosphere, would its average surface temperature be higher or lower than what it is now? Explain.
Which is the correct ascending order of wavelengths?
Assertion (A): Ultraviolet radiations is scattered more as compared to the microwave radiations.
Reason (R): Wavelength of ultraviolet radiation is more than the wavelength of microwave radiation.
