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प्रश्न
An electromagnetic radiation is used for photography in fog. [2]
(i) Identify the radiation.
(ii) Why is this radiation mentioned by you, ideal for this purpose ?
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उत्तर
(i) Infared radiation.
(ii) They have low frequency, the energy associated with them is also low so they do not scatter much and can penetrate appreciably through it.
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संबंधित प्रश्न
A radioactive substance is oxidized. Will there be any change in the nature its radioactivity? Give a reason for your answer
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An element P disintegrates by α - -emission and the new element suffers two further disintegrations, both by β -emission, to form an element Q. Explain the fact that P and Q are the isotopes.
What are the types of emission?
State any two uses of cathode rays.
In a cathode ray tube state the purpose of the fluorescent screen.
Which of the following statements is/are correct?
- α particles are photons
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- Ionization power is maximum for α rays
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