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प्रश्न
-
- Calculate the speed of the wave.
- Name the medium through which it is traveling.
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उत्तर
a. We know that,
v = f λ
Here it is given that c = 3 × 108 m/s
and, f = 500 MHz = 500 × 106 Hz
λ = 60 cm = 0.6 m
∴ v = (500 × 106 ) × (0.6) = 3 × 108 m/s
which is the same as the velocity of the e-m wave in vacuum or air.
b. The medium through which it is travelling is either air or vacuum.
संबंधित प्रश्न
Identify the part of the electromagnetic spectrum which is:
produced by bombarding a metal target by high speed electrons.
The terminology of different parts of the electromagnetic spectrum is given in the text. Use the formula E = hv (for energy of a quantum of radiation: photon) and obtain the photon energy in units of eV for different parts of the electromagnetic spectrum. In what way are the different scales of photon energies that you obtain related to the sources of electromagnetic radiation?
Arrange the following radiations in the order of their increasing wavelength:
X-rays, infrared rays, ratio waves, gamma ray and microwaves.
What is the range of the wavelength of the following electromagnetic waves?
(a) Ultraviolet
Give one use of microwaves.
One of the following wavelengths is absent and the rest are present in the X-rays coming from a Coolidge tube. Which one is the absent wavelength?
For a given material, the energy and wavelength of characteristic X-rays satisfy
(a) E(Kα) > E(Kβ) > E(Kγ)
(b) E(Mα) > E(Lα) > E(Kα)
(c) λ(Kα) > λ(Kβ) > λ(Kγ)
(d) λ(Mα) > λ(Lα) > λ(Kα).
The ozone layer absorbs
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.
Name the electromagnetic radiation whose frequency is 10 Hz.
