Assertion :If a sphere of mass $m$ moving with speed $u$ undergoes a perfectly elastic head-on collision with another sphere of heavier mass $M$ at rest $(M > m)$ , then direction of velocity of sphere of mass $m$ is reversed due to collision (no external force acts on system of two spheres). Reason: During a collision of sphere collision of sphere of unequal masses, the heavier mass exerts more force on the lighter mass in comparison to the force which lighter exerts on the heavier one.

Both Assertion and Reason are correct and Reason is the correct explanation for Assertion

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Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion

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Assertion is correct but Reason is incorrect

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Assertion is incorrect and Reason is correct

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Solution

The correct option is C Assertion is correct but Reason is incorrect
Assertion is correct but reason is incorrect because both mass exert equal forces on each an another.
Hence, the answer is Assertion is correct but Reason is incorrect.

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Q. Assertion :If a sphere of mass m moving with speed u undergoes a perfectly elastic head-on collision with another sphere of heavier mass M at rest (M > m), then direction of velocity of sphere of mass m is reversed due to collision (no external force acts on system of two spheres). Reason: During a collision of sphere of unequal masses, the heavier mass exerts more force on the lighter mass in comparison to the force which lighter mass exerts on the heavier one.

Q. Two spheres of different masses moving in the same direction undergo perfect head on elastic collision.
Then,
a) Their velocities are interchanged if they are of same mass
b) If the heavier sphere were at rest before collision. it continues to be at rest after collision and the lighter sphere retraces its path with the same velocity
c) If the lighter sphere were at rest before collision, it moves with the velocity of the heavier sphere and the heavier sphere continues to move with its original velocity after collision.
d) If the lighter sphere were at rest before collision, it moves with double the velocity of the heavier sphere and the heavier sphere continues to move with its original velocity, after collision.

Assertion (A) All collision of reactant molecules lead to product formation.

Reason (R) Only those collisions in which molecules have correct orientation and sufficient kinetic energy lead to compound formation.

(a) Both assertion and reason are correct and the reason is correct explanation of assertion
(b) Both assertion and reason are correct, but reason does not explain assertion.
(c) Assertion is correct, but reason is incorrect
(d) Both assertion and reason are incorrect
(e) Assertion is incorrect but reason is correct.

Q. Two small spheres of equal mass, and heading towards each other with equal speeds, undergo a headon collision (no external force acts on system of two spheres). Then which of the following statement is correct?

Assertion (A) Rate constant determined from Arrhenius equation are fairly accurate for simple as well as complex molecules.

Reason (R) Reactant molecules undergo chemical change irrespective of their orientation during collision.

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The correct option is C Assertion is correct but Reason is incorrectAssertion is correct but reason is incorrect because both mass exert equal forces on each an another.Hence, the answer is Assertion is correct but Reason is incorrect.

The correct option is C Assertion is correct but Reason is incorrect
Assertion is correct but reason is incorrect because both mass exert equal forces on each an another.
Hence, the answer is Assertion is correct but Reason is incorrect.