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KVPY2010PhysicsNuclear Physics

At time t =0 , a container has N ₀ radioactive atoms with a decay constant . In addition, c numbers of atoms of the same type are being added to the container per unit time. How many atoms of this type are there at t = T ?

Options

  1. Ac (- T)- N ₀ (- T )
  2. Bc (- T )+ N ₀ (- T )
  3. Cc 1- (- T ) + N ₀ (- T )
  4. Dc 1+ (- T ) + N ₀ (- T )

Correct answer

C. c 1- (- T ) + N ₀ (- T )

Step-by-step solution

N ₀ -initial nucleon at t =0, ~N ₀ Addition is at a constant rate array l ( N - C )=- d N dt ₀^ k dt = _ N ₀ ^ N d N N - C array Integrating we get array l N = C + e ^ - t ( N ₀- C ) N = C (1- e ^ - t )+ N ₀ e ^ - t array

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