[Single-digit Integer] The work function (φ) of some metals is listed below. The number of metals which will show photoelectric effect when light of 300 nm wavelength falls on the metal is: Li (2.4 eV

Question

[Single-digit Integer] The work function (φ) of some metals is listed below. The number of metals which will show photoelectric effect when light of 300 nm wavelength falls on the metal is: Li (2.4 eV), Na (2.3 eV), K (2.2 eV), Mg (3.7 eV), Cu (4.8 eV), Ag (4.3 eV), Fe (4.7 eV), Pt (6.3 eV), W (4.75 eV)

Prashant Kotian · Accepted Answer

Correct answer: 0004. Energy of 300 nm light = 1240/300 = 4.13 eV. Metals with φ < 4.13 eV: Li (2.4), Na (2.3), K (2.2), Mg (3.7). Total = 4 metals.

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