A photon of energy 5.4852 eV librates an electron from the Li-atom initially at rest. The emitted electron moves at right angles to the direction in which photon moves. Find the speed and the direction in which Li + ion will move. Ionisation potential of Li atom = 5.3918 V, M (Li) = 6.94 gm, m e = 9.1 × 10 –31 kg
Text Solution
Verified by ExpertsThe correct answer is:
CHECK THE SOLUTION.
Sol. 
For emitted electron,
Electron momentum:
Mass of 
ion:
By conservation of momentum,
Direction: opposite to emitted electron (almost perpendicular to photon direction).
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