Ncert Exercises & Solutions

Match the following.

Column I	Column II
A. Photon	1. Value is 4 for N-shell
B. Electron	2. Probability density
C. $ψ^{2}$	3. Always positive value
D. Principle quantum number n	4. Exhibits both momentum and wavelength

Hint: $ψ^{2}$ tells about probability density

A. Photon has particle nature as well as wave nature. It exhibits both momentum and wavelength.

B. Electron also has particle nature as well as wave nature. Thus, it also exhibits both momentum and wavelength.

C. $ψ^{2}$ represents the probability density of electrons and always has positive values.

D. Principle quantum number n=4 for N-shell.

K L M N

n = 1 2 3 4

It always has positive values.