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संबंधित प्रश्न
How can they be made to leave the metal surface? (State any two ways)
Why is a cathode ray tube evacuated to a low pressure?
Complete the diagram as given above by drawing the deflection of radioactive radiations in an electric field
What are isobars?
Name two radioactive substances.
In a cathode ray tube state the purpose of covering cathode by thorium and carbon.
A certain nucleus has a mass number 20 and atomic number 9. Find the number of neutrons and protons present in it.
A radioactive element is placed in an evacuated chamber. Then the rate of radioactive decay will ______.
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.
