Question

Radiation of a certain wavelength causes electrons with a maximum kinetic energy of 0. 62 eV to be ejected from a metal whose work function is 2. 90 eV. What will be the maximum kinetic energy with which this same radiation ejects electrons from another metal whose work function is 2. 05 eV

Answer 1

1.47 eV

Step-by-step explanation:

We have,
Stopping potential = E
KE1(max) = 0.62 eV
Ф1 = 2.90 eV

We know KE(max) = E - Φ

0.62 = E - 2.9
So, E = 2.9 + 0.62 = 3.52 eV

Now, all we have to do is evaluate for the metal with Φ = 2.05 eV
KE(max)2 = 3.52 - 2.05 = 1.47 eV