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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
Why are microwaves considered suitable for radar systems used in aircraft navigation?
What is the range of the wavelength of the following electromagnetic waves?
(a) Micro waves .
Give one use of gamma rays.
An electromagnetic wave has a frequency of 500 MHz and a wavelength of 60 cm.name the medium through which it is travelling
The Kα and Kβ X-rays of molybdenum have wavelengths 0.71 A and 0.63 A respectively. Find the wavelength of Lα X-ray of molybdenum.
To which regions of the electromagnetic spectrum do the following wavelengths belong:
(a) 250 nm
(b) 1500 nm
Answer briefly.
Give two uses of radio waves.
Find the photon energy in units of ev for electromagnetic wave if waves length 40 m. Given h = 6.63 × 10–34 J.
Electromagnetic waves of wavelengths λ1, λ2 and λ3 are used in a radar system, in water purifiers and in remote switches of TV, respectively.
- Identify the electromagnetic waves.
- Write one source for each of them.
Below is an incomplete table showing the arrangement of electromagnetic spectrum in the increasing order of their wavelength. Complete the table:
| Gamma ray | X - ray | UV rays | Visible rays | Infrared | A | Radio waves |
- Identify the radiation A.
- Name the radiation used to detect fracture in bones.
- Name one property common to both A and Radio waves.
