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प्रश्न
Name the radiation of the electromagnetic spectrum which is used for the following:
Radar and Give the frequency range.
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उत्तर
Microwave (109 − 1012)Hz
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संबंधित प्रश्न
Given below are some famous numbers associated with electromagnetic radiations in different contexts in physics. State the part of the electromagnetic spectrum to which each belongs.
(a) 21 cm (wavelength emitted by atomic hydrogen in interstellar space).
(b) 1057 MHz (frequency of radiation arising from two close energy levels in hydrogen; known as Lamb shift).
(c) 2.7 K [temperature associated with the isotropic radiation filling all space-thought to be a relic of the ‘big-bang’ origin of the universe].
(d) 5890 Å - 5896 Å [double lines of sodium]
(e) 14.4 keV [energy of a particular transition in 57Fe nucleus associated with a famous high resolution spectroscopic method (Mössbauer spectroscopy)].
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Name two sources of infrared radiation.
State three properties of infrared radiations similar to that of visible light.
Give one use of electromagnetic radiation in Microwaves.
Light of wavelength `3500A` is incident on two metals A and B whose work functions are 3.2 eV and 1.9 eV respectively. Which metal will emit photoelectrons?
The ratio of contributions made by the electric field and magnetic field components to the intensity of an EM wave is ______.
Write two uses of the following radiation.
X-rays
