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प्रश्न
State any two precautions to be taken while handling radioactive substances
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उत्तर
The two safety precautions to be taken while handling radioactive substances are (any two):
- Radioactive substances should be kept in thick lead containers with a very narrow opening so as to restrict the radiations coming out from other directions
- Radioactive materials should be handled with long lead tongs.
- People working with radioactive substances should put on special lead-lined aprons and lead gloves
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संबंधित प्रश्न
When does the nucleus of an atom tend to become radioactive?
How can they be made to leave the metal surface? (State any two ways)
Arrange α, β, and γ rays in ascending order with respect to their
1) Penetrating power.
2) Ionising power
3) Biological effect
Draw a diagram of a simple atom showing the nucleus and electrons. In this atom:
(a) What type of charge will there be on the nucleus?
(b) What is the value of this charge?
Name a common device where a hot cathode ray tube is used.
State three ways of obtaining an electron-beam.
The mean lives of a radioactive substance are 1620 and 405 years for β-emission and β-emission respectively. The time after which three fourth of a sample will decay if it is decaying both by β-emission and β-emission simultaneously will be ______ years.
(Take ln 2 = 0.693)
Assertion (A): Hydrogen atom consists of only one electron but its emission spectrum has may lines.
Reason (R): Only Lyman series is found in the absorption spectrum of hydrogen atom whereas in the emission spectrum, all the series are found.
