Values of work function () for a few metals are given below:

| Metal | Li | Na | K | Mg | Cu | Ag |
|---|---|---|---|---|---|---|
| (eV) | 2.42 | 2.3 | 2.25 | 3.7 | 4.8 | 4.3 |

The number of metals

Question

Values of work function () for a few metals are given below:

| Metal | Li | Na | K | Mg | Cu | Ag |
|---|---|---|---|---|---|---|
|  (eV) | 2.42 | 2.3 | 2.25 | 3.7 | 4.8 | 4.3 |

The number of metals which will show photoelectric effect when light of 400 nm falls on it is .

Given:  J s,  ms,  C

Canvas Classes · Accepted Answer

Energy of photon at 400 nm:

In eV:

Metals with  eV: Li (2.42), Na (2.3), K (2.25) — 3 metals

Mg (3.7), Cu (4.8), Ag (4.3) will NOT show photoelectric effect.

Answer: 3

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