Which among the following metals requires radiation of the shortest wavelength to cause emission of electrons?

N a

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K

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M g

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C a

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Solution

The correct option is C $M g$
Ionisation energies of IIA group elements are greater than IA group
$(M g, C a) > (N a, K)$
Also,among IIA group elements first ionisation energy gradually decreases as we descend the group.
$M g > C a > N a > K$
Since energy is inversely proportional to wavelength, a radiation of the shortest wavelength means that energy should be high. The one with the highest ionisation energy among the given elements is $M g$ .

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Which of the following metals requires the radiation of highest frequency to cause the emission of electrons?

N a = 2.75 e V, K = 2.3 e V, M o = 4.17 e V

N i = 5.15 e V

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