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प्रश्न
State three properties of infrared radiations similar to that of visible light.
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उत्तर
(i) Infrared radiations and visible light both travel in a vacuum with a speed of 3 × 108 ms−1.
(ii) Both the infrared radiations and the visible light obey the laws of reflection and refraction.
(iii) Both the infrared radiations and the visible light are electromagnetic waves.
संबंधित प्रश्न
To which part of the electromagnetic spectrum does a wave of frequency 5 × 1011 Hz belong?
When a Coolidge tube is operated for some time it becomes hot. Where does the heat come from?
Characteristic X-rays may be used to identify the element from which they are being emitted. Can continuous X-rays be used for this purpose?
The X-ray beam emerging from an X-ray tube
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 scientist who discovered Visible light
Arrange the following electromagnetic waves in increasing order of their frequencies (i.e. begin with the lowest frequency):
Visible light, y rays, X rays, microwaves, radio waves, infrared radiations, and ultraviolet radiation.
Name the radiation of the electromagnetic spectrum which is used for the following:
Radar and Give the frequency range.
Name the e.m. waves which are suitable for radar systems used in aircraft navigation. Write the range of frequency of these waves.
Identify the part of the electromagnetic spectrum which:
- produces the heating effect.
- is absorbed by the ozone layer in the atmosphere.
- is used for studying crystal structure.
Write any one method of the production of each of the above radiations.
