COMEDK · Physics · 27. Dual Nature of Matter

A particle of mass \(2 \mathrm{mg}\) has the same wavelength as a neutron moving with a velocity of \(3 \times 10^5 \mathrm{~ms}^{-1}\). The velocity of the particle is (mass of neutron is \(1.67 \times 10^{-27} \mathrm{Kg}\))

A \(1.5 \times 10^{-13} \mathrm{~ms}^{-1}\)
B \(2.5 \times 10^{-16} \mathrm{~ms}^{-1}\)
C \(1.5 \times 10^{-16} \mathrm{~ms}^{-1}\)
D \(2.5 \times 10^{-13} \mathrm{~ms}^{-1}\)

Verified Solution

Answer & Solution

Correct Answer

(B) \(2.5 \times 10^{-16} \mathrm{~ms}^{-1}\)

Step-by-step Solution

Detailed explanation

The de Broglie wavelength \(\lambda\) is given by the relation \(\lambda = \dfrac{h}{mv}\). Since the particle and the neutron have the same wavelength, we have \(\lambda_{p} = \lambda_{n}\), which implies \(m_{p} v_{p} = m_{n} v_{n}\). Given values are: Mass of particle…

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.

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