Practicing Success

Target Exam

CUET

Subject

Physics

Chapter

Dual Nature of Radiation and Matter

Question:

The wavelength of light from the spectral emission line of sodium is 662 nm. The kinetic energy at which an electron would have same de-Broglie wavelength would be: $(h=6.62× 10^{-34} J-s, m_e=9×10^{-31} kg)$

Options:

$5.5 × 10^{-25} J$

$5.5 × 10^{-24} J$

$18 × 10^{-23} J$

$4.5 × 10^{-22} J$

Correct Answer:

$5.5 × 10^{-25} J$

Explanation:

The correct answer is Option (1) → $5.5 × 10^{-25} J$