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प्रश्न
The small ozone layer on top of the stratosphere is crucial for human survival. Why?
उत्तर
The small ozone layer on the top of the atmosphere is crucial for human survival because it absorbs harmful ultraviolet radiations present in sunlight and prevents it from reaching the Earth’s surface.
संबंधित प्रश्न
Why are microwaves considered suitable for radar systems used in aircraft navigation?
Give a reason for the following:
Long-distance radio broadcasts use short-wave bands. Why?
State Moseley's law
A wave has a wavelength of 10-3 nm. Name the wave.
What is the range of the wavelength of the following electromagnetic waves?
(a) Infrared.
Name the waves produced by the changes in the nucleus of an atom.
For harder X-rays,
(a) the wavelength is higher
(b) the intensity is higher
(c) the frequency is higher
(d) the photon energy is higher.
Name the scientist who discovered
X-rays
Name the scientist who discovered Visible light
Name the scientist who discovered radio waves
Name the radiation which can be detected by thermopile.
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.
Calculate the wavelength of a microwave of a frequency of 8.0 GHz.
Following QN ∴ 14, the radiation force on the roof will be
The frequency of e. m waves which is best suited .to observed of radius 3 × 10–4 his of the order of
Electromagnetic waves with wavelength
- λ1 is suitable for radar systems used in aircraft navigation.
- λ2 is used to kill germs in water purifiers.
- λ3 is used to improve visibility in runways during fog and mist conditions.
Identify and name the part of the electromagnetic spectrum to which these radiations belong. Also arrange these wavelengths in ascending order of their magnitude.
Write two uses of the following radiation.
Gamma rays
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.
Choose the correct option related to wavelengths (λ) of different parts of the electromagnetic spectrum.
Name one radiation having the wavelength longer than the wavelength of these radiations.
