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The work function for aluminium surface is 4.2 eV and that for sodium surface is 2.0 ev. The two metals were illuminated with appropriate radiations so as to cause photo emission. Then

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Both aluminium and sodium will have the same threshold frequency

The threshold frequency of aluminium will be more than that of sodium

The threshold frequency of aluminium will be less than that of sodium

The threshold wavelength of aluminium will be more than that of sodium

answer is B.

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The threshold frequency for Al must be greater as it has higher work function $(∵ W = h_{0})$

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