Question

Assertion: According to de Broglie, the wavelengths associated with electrons and other subatomic particles can be detected experimentally.
Reason : The wavelength associated with any material particle is directly proportional to its mass.

• A. If both assertion and reason are true and reason is the correct explanation of assertion.
• B. If both assertion and reason are true but reason is not the correct explanation of assertion.
• C. If assertion is true but reason is false.
• D. If both assertion and reason are false.

Answer 1

Answer: (C)

According to de Broglie's equation
$\lambda =\frac{h}{mv}$
where, $\lambda =$ de Broglie wavelength
$h=6.626\times 10^{-34}Js=$ Planck's constant
$m=$ mass of particle
mass of electron $=9.110\times 10^{-28}g$
$v=$ speed of particle
thus, for different particles, the wavelength is inversely proportional to their masses
Higher is the mass shorter will be the wavelength associated with it: