Question

Which of the following has the largest de Broglie wavelength, provided all have equal velocity?

• A. Carbon dioxide molecule
• B. Ammonia molecule
• C. Oxygen molecule
• D. Nitrogen molecule

Answer 1

The correct option is B Ammonia molecule

Atomic mass, $N{H}_3=17amu,C{O}_2=44amu,O_2=32amu,N_2=28amu$

$\lambda =\frac{h}{mv}$; $\lambda \propto \frac{1}{m}$

Ammonia has the least atomic mass, therefore, its wavelength is maximum.