Assertion (A) A particle of mass M at rest decay into two particles of masses m1 and m2, having non-zero velocities will have ratio of de-Broglie wavelengths unity. Reason (R) Here we cannot apply conservation of linear momentum.

• A. If both Assertion and Reason are true and Reason is 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.