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प्रश्न
Name two sources of infrared radiation.
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उत्तर
(i) Infrared lamp, (ii) Fire.
संबंधित प्रश्न
Give a reason for the following:
Long-distance radio broadcasts use short-wave bands. Why?
Two waves A and B have wavelength 0.01 Å and 9000 Å respectively.
- Name the two waves.
- Compare the speeds of these waves when they travel in vacuum.
Can Lα X-ray of one material have shorter wavelength than Kα X-ray of another?
X-ray incident on a material
(a) exerts a force on it
(b) transfers energy to it
(c) transfers momentum to it
(d) transfers impulse to it.
Iron emits Kα X-ray of energy 6.4 keV. Calculate the times taken by an iron Kα photon to cross through a distance of 3 km.
(Use Planck constant h = 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:
To photograph internal parts of the human body and Give the frequency range
Answer briefly.
Why are microwaves used in radar?
Answer briefly.
Name the most harmful radiation entering the Earth's atmosphere from outer space.
If the Earth did not have atmosphere, would its average surface temperature be higher or lower than what it is now? Explain.
Name the electromagnetic radiation that has been used in obtaining the image below.
