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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
Answer the following questions based on a hot cathode ray tube
Name the charged particles
What happens to the atomic number of element when (i) An α -particle, (ii) A β -particle 1 and (iii) γ-radiation is emitted?
A radioactive source emits three types of radiations. Name them.
(i) Name the radiations which are charged.
(ii) Name the radiations which are most penetrating.
(iii) Name the radiations which travel with the speed of light.
(iv) Name the radiations which have the largest mass.
A nucleus of an element X which has the symbol `""_84^202` X emits an alpha particle and then a beta particle. The final nucleus is `""_"b"^"a"` Y Find a and b.
Explain, why radium paint, consisting of zinc sulphide and a trace of radium salt, glows in the dark?
State one use of radio-isotopes.
In the following atoms, which one is a radioisotope? Give one use of this isotope.
O16, C14, N14, He4
Assertion (A): The force of repulsion between atomic nucleus and α-particle varies with distance according to inverse square law.
Reason (R): Rutherford did α-particles scattering experiment.
