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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
Name the subjective property of light related to its wavelength.
A wave has a wavelength of 10-3 nm. Name the wave.
Mark the correct options.
(a) An atom with a vacancy has smaller energy that a neutral atom.
(b) K X-ray is emitted when a hole makes a jump from the K shell to some other shell.
(c) The wavelength of K X-ray is smaller than the wavelength of L X-ray of the same material.
(d) The wavelength of Kα X-ray is smaller than the wavelength of Kβ X-ray of the same material.
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.
(Use Planck constant h = 6.63 × 10-34 Js= 4.14 × 10-15 eVs, speed of light c = 3 × 108 m/s.)
An X-ray tube operates at 40 kV. Suppose the electron converts 70% of its energy into a photon at each collision. Find the lowest there wavelengths emitted from the tube. Neglect the energy imparted to the atom with which the electron collides.
(Use Planck constant h = 6.63 × 10-34 Js= 4.14 × 10-15 eVs, speed of light c = 3 × 108 m/s.)
Give one use of electromagnetic radiation in Ultraviolet radiation.
Answer briefly.
Can we produce a pure electric or magnetic wave in space? Why?
Name the e.m. waves which are suitable for radar systems used in aircraft navigation. Write the range of frequency of these waves.
The ratio of contributions made by the electric field and magnetic field components to the intensity of an EM wave is ______.
Given below in the left column are different modes of communication using the kinds of waves given in the right column.
| A. | Optical Fibre Communication |
P. | Ultrasound |
| B. | Radar | Q. | Infrared Light |
| C. | Sonar | R. | Microwaves |
| D. | Mobile Phones | S. | Radio Waves |
From the options given below, find the most appropriate match between entries in the left and the right column.
