MHT CET · Physics · Dual Nature of Matter

According to de-Broglie hypothesis, the wavelength associated with moving electron of mass $m$ is $\lambda_{\varepsilon}$. Using mass energy relation and Planck's quantum theory, the wavelength associated with photon is $\lambda_p$. If the energy $(E)$ of electron and photon is same then relation between $\lambda_{\varepsilon}$ and $\lambda_p$ is

A $λ_{p} α λ_{e}$
B $λ_{p} α λ_{e}^{2}$
C $λ_{p} α \sqrt{λ_{e}}$
D $λ_{p} α \frac{1}{λ_{e}}$

Verified Solution

Answer & Solution

Correct Answer

(A) $λ_{p} α λ_{e}$

Step-by-step Solution

Detailed explanation

For photon:

E = \frac{h c}{λ_{p}}

∴ λ_{p} = \frac{h c}{E}

..........(i)
For electron:

E = m c^{2} = p c

∴ p = \frac{E}{C}

λ_{e} = \frac{h}{p} = \frac{h c}{E}

........(ii)
By Equations. (i) and (ii),

λ_{p} \propto λ_{e}

Apply the relevant identity from the chapter and substitute the values established in the previous step, keeping the original constraint in view.

Use the simplified expression to isolate the unknown, then plug the result back into the question setup to confirm the working is internally consistent.

Cross-check against a boundary or limiting case. Both the dimensional balance and the qualitative behaviour at the extreme should agree with the candidate answer.

Combine the steps above to identify the correct option. The remaining choices each fail at least one of the consistency, dimensional, or boundary checks.

Same subject

Explore more questions on app

From MHT CET

Explore more questions on app