⚛️ Physics · Dual Nature of Radiation and Matter · NEET & JEE

An electron and a proton are moving with equal kinetic energies. What is the ratio of their de Broglie wavelengths, λe/λp?

Answer: 1836.

A 1/√1836
B 1836
C √1836
D 1/1836

Correct answer: C. √1836

Explanation: For non-relativistic particles, λ = h/√(2mK). At equal kinetic energy, λ is proportional to 1/√m. Thus λe/λp = √(mp/me) = √1836.

In the photoelectric setup, light striking the metal plate ejects electrons that cross the evacuated tube to the collector, producing a measurable current on the ammeter.

Concept context

Photoelectric effect, de Broglie waves, Bohr's model, atomic spectra.

Read the full Dual Nature of Radiation and Matter notes →

An electron and a proton are moving with equal kinetic energies. What is the ratio of their de Broglie wavelengths, &lambda;<sub>e</sub>/&lambda;<sub>p</sub>?

Concept context

More Dual Nature of Radiation and Matter questions

An electron and a proton are moving with equal kinetic energies. What is the ratio of their de Broglie wavelengths, λ<sub>e</sub>/λ<sub>p</sub>?