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Chapter 38: Q. 1 (page 1114)

Which metals in Table 38.1 exhibit the photoelectric effect for (a) light with位=400nm and (b) light with 位=250nm?

Short Answer

Expert verified

a. Sodium

b. Iron.

Step by step solution

01

Part (a) Step 1: Given information

We have given,

位=400nm

We have to find the metal for the photo electric effect.

02

Simplify

For 位=400nm, the energy will be

E=hc位E=1240eV.nm400nmE=3.1eV

Then we can say that the sodium will be the metal for which we need the400nmwavelength source light.

03

Part (b) Step 1: Given information

We have given,

位=250nm

We have to find the metal for the photoelectric effect.

04

Simplify

The energy will be given by,

E=hc位E=1240eV.nm250nmE=4.96eV

For this much energy we need the iron metal.

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