AP and TS EAMCET Engineering Model Paper 14

Question : 121 of 159

Marks: +1, -0

CHEMISTRY

Work functions of five metals are 2ev/atom, 3.1ev/atom, 3.8ev/atom, 4.3ev/atom and 5ev/atom respectively. If the wavelength of incident radiation is 3000Å then the number of metals showing photo electric effect are/is

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Metal‌No	work‌function(ev)	Work‌function(J)
1	2‌ev	2×1.602×10−19=3.204×10−19
2	3.1‌ev	3.1×1.602×10−19=4.966×10−19
3	3.8‌ev	3.8×1.602×10−19=6.087×10−19
4	4.3‌ev	4.3×1.602×10−19=6.89×10−19
5	5‌ev	5.0×1.602×10−19=8.01×10−19