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Column-I Column-II
A) Decreasing order of masses P) e^– > p > n
B) Decreasing order of e/m values Q) p > e^– > n
C) Decreasing order of de-Broglie’s wavelength with same velocities R) n > p > e^–
D) Decreasing order of uncertainity in velocity when $∆$ x is same S) n > e^– > p
A B C D
1 R P P P
2 P Q R S
3 S R Q P
4 P P R S

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answer is A.

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Detailed Solution

m_e = 9.1 × 10^–31kg; m_p = 1.672 × 10^–27kg;
m_n = 1.675 × 10^–27kg
charge of e^– = –1.6 × 10^–19C
charge of p = +1.6 × 10^–19C
charge of n = 0

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