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प्रश्न
Name of physical quantity which remains same for microwaves of wavelength 1 mm and UV radiations of 1600 Å in vacuum.
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उत्तर
Both microwaves and UV rays are a part of the electromagnetic spectrum. Thus, the physical quantity that remains same for both types of radiation will be their speeds, equal to c.
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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)].
Name the electromagnetic radiations used for (a) water purification, and (b) eye surgery.
Can X-rays be polarised?
Can a hydrogen atom emit characteristic X-rays?
Name three radiations and their wavelength range which are invisible and beyond the violet end of the visible spectrum.
State two properties of infrared radiations which differ from visible light.
Answer briefly.
Name the most harmful radiation entering the Earth's atmosphere from outer space.
Give any two uses of infrared waves.
Name the electromagnetic radiation whose frequency is 10 Hz.
Which part of the electromagnetic spectrum can the human eye detect?
