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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
State Moseley's law
Which radiation is used for satellite communication?
The potential difference applied to an X-ray tube is increased. As a result, in the emitted radiation,
(a) the intensity increases
(b) the minimum wavelength increases
(c) the intensity remains unchanged
(d) the minimum wavelength decreases.
| Gamma rays | D | C | Visible light | B | A |
The above table shows different parts of the electromagnetic spectrum.
(a) Identify the parts of the spectrum marked as A, B, C and D.
(b) Which of the radiations A or B has the higher frequency?
(c) State two properties which are common to all parts of the electromagnetic spectrum.
(d) Name one source of each of the radiation of electromagnetic spectrum.
(e) Name one detector for each of the radiation.
(f) Name one use of each of the radiation.
How will you investigate the existence of the radiation beyond the red and violet extremes of the spectrum?
State three properties of ultra-violet radiation similar to visible light.
Choose the correct option.
Earth’s atmosphere is richest in
For television broadcasting, the frequency employed is normally
The magnetic field of a beam emerging from a filter facing a floodlight is given by B0 = 12 × 10–8 sin (1.20 × 107z – 3.60 × 1015t) T. What is the average intensity of the beam?
Identify the electromagnetic wave whose wavelength range is from about 10-3 m to about 10-1 m. Write one use of this.
