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प्रश्न
Name the scientist who discovered Visible light
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उत्तर
Newton
APPEARS IN
संबंधित प्रश्न
State Moseley's law
Name the radiations of wavelength just shorter than 4 × 10-7 m.
How are X-rays produced?
Frequencies of Kα X-rays of different materials are measured. Which one of the graphs in the figure may represent the relation between the frequency v and the atomic number Z ?
The potential difference applied to an X-ray tube is increased. As a result, in the emitted radiation,
(a) the intensity increases
(b) the minimum wavelength increases
(c) the intensity remains unchanged
(d) the minimum wavelength decreases.
The Kβ X-ray of argon has a wavelength of 0.36 nm. The minimum energy needed to ionize an argon atom is 16 eV. Find the energy needed to knock out an electron from the K shell of an argon atom.
Name the part of the electromagnetic spectrum which is:
Produced by bombarding a metal target with high electrons.
Name the radiation of the electromagnetic spectrum which is used for the following:
To photograph internal parts of the human body and Give the frequency range
Answer briefly.
Name the most harmful radiation entering the Earth's atmosphere from outer space.
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.
