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प्रश्न
What are free electrons?
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उत्तर
Electrons revolving in the outermost orbit of an atom which are weakly held by the nucleus are called free electrons
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संबंधित प्रश्न
Answer the following questions based on a hot cathode ray tube.
State the approximate voltage used to heat the filament
Why is a cathode ray tube evacuated to a low pressure?
What happens to the mass number of an element when (i) an α -particle, (ii) a β -particle, and (iii) γ -radiation is emitted?
A radioactive source emits three types of radiations.
Name the radiation which has the highest ionizing power.
State any two uses of cathode rays.
State three common properties of beta rays and cathode rays.
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)
A radioctive sample decays `7/8` times its original quantity in 15 minutes. The half-life of the sample is ______.
