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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 ?
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
Represent the change in the nucleus of a radioactive element when a β particle is emitted.
In a cathode ray tube state:
(i) the purpose of covering cathode by thorium and carbon.
(ii) the purpose of the fluorescent screen.
(iii) how is it possible to increase the rate of emission of electrons.
What kind of change takes place in a nucleus when a β -particle is emitted?
In the following fig. shows a radioactive source S in a thick lead container. The radiations pass through an electric field between the plates P and Q. Complete the diagram to show the paths of α , β and γ radiations.
Why is the source S placed in a thick lead container?
A radioactive source emits three types of radiations.
Name the radiation which has the highest ionizing power.
Define bound electrons.
State one use of radio-isotopes.
The half-life of a radioactive nuclide is 100 hours. The fraction of original activity that will remain after 150 hours would be ______.
