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प्रश्न
Name the scientist who discovered Infra-red waves
उत्तर
Hershell
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संबंधित प्रश्न
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 Kβ X-rays from certain elements are given below. Draw a Moseley-type plot of √v versus Z for Kβ radiation.
| Element | Ne | P | Ca | Mn | Zn | Br |
| Energy (keV) | 0.858 | 2.14 | 4.02 | 6.51 | 9.57 | 13.3 |
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.
Name the radiation of the electromagnetic spectrum which is used for the following:
Radar and Give the frequency range.
How will you investigate the existence of the radiation beyond the red and violet extremes of the spectrum?
State two properties of infrared radiations which differ from visible light.
State three properties of infrared radiations similar to that of visible light.
Light of wavelength `3500A` is incident on two metals A and B whose work functions are 3.2 eV and 1.9 eV respectively. Which metal will emit photoelectrons?
Radio waves of constant amplitude can be generated with.
All components of the electromagnetic spectrum in a vacuum have the same ______
