Question

Assertion :A proton and an electron both have energy 50 eV. Both have different wavelengths Reason: Wavelength depends on energy and not on mass.

• A. Both Assertion and Reason are correct and Reason is the correct explanation for Assertion
• B. Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion
• C. Assertion is correct but Reason is incorrect
• D. Assertion is incorrect but Reason is correct

Answer 1

The correct option is C Assertion is correct but Reason is incorrect

de-Broglie wavelength of the particle $\lambda =\frac{h}{p}=\frac{h}{\sqrt{2mK}}$
where $p=\sqrt{2mK}$
Thus wavelength of particle depends on both energy as well as on mass.
Although, both proton and electron have same energy, but they have different mass which results in different wavelengths.
Thus assertion is correct but reason in incorrect.