2 - Atomic Physics Questions Answers

Consider an electron trapped in an infinite well whose width is 98.5 pm. If it is in a state with n = 15, what are (i) its energy? (ii) the uncertainty in its momentum? (iii) the uncertainty in its position?

Asked By: ANKIT SONI
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Joshi sir comment

Let width=b For nth state nλ2=b λ=2bn Now E =p22m = (hλ)22m Solve after putting the value of λ  Uncertainty in position=b Now use p.x = nh/2π for finding uncertainty in momentum 

a toy car of mass 500g travels with a uniform velocity of 25m/s for 5 seconds, the brakes are then applied and the car is uniformly retarded and comes to rest in further 10s calculate the retardation

Asked By: SARABJEET
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Joshi sir comment

use v = u + at 

u = 25, v = 0 and t = 10   

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