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प्रश्न
Gamma rays and radio waves travel with the same velocity in free space. Distinguish between them in terms of their origin and the main application.
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उत्तर
| Gamma rays | Radio waves | |
| Origin: | Nuclear decay | Lightning |
| From the hottest and most energetic objects in the universe, such as neutron stars, pulsars, supernova explosions, and regions around black holes. | From broadcast radio towers, cell phones, and radars. | |
| Application: | It is used in radiotherapy, sterilisation, and disinfection. | It is used in fixed and mobile radio communication, radar and other navigation systems, communications satellites, and computer networks. |
संबंधित प्रश्न
To which part of the electromagnetic spectrum does a wave of frequency 5 × 1011 Hz belong?
The wavelengths for the light of red and blue colours are roughly 7.8 × `10^7` m and 4.8 × `10^7` m respectively.
(a) Which colour has the greater speed in vacuum?
(b) Which colour has the greater speed in glass?
Give one use of ultraviolet radiation.
The energy of a silver atom with a vacancy in K shell is 25.31 keV, in L shell is 3.56 keV and in M shell is 0.530 keV higher than the energy of the atom with no vacancy. Find the frequency of Kα, Kβ and Lα X-rays of silver.
(Use Planck constant h = 6.63 × 10-34 Js= 4.14 × 10-15 eVs, speed of light c = 3 × 108 m/s.)
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.
Define the term "Intensity" in the photon picture of electromagnetic radiation.
State two uses of infrared radiations.
Name the e.m. waves which are suitable for radar systems used in aircraft navigation. Write the range of frequency of these waves.
If the Earth did not have atmosphere, would its average surface temperature be higher or lower than what it is now? Explain.
Why does microwave oven heats up a food item containing water molecules most efficiently?
