The half life of a radioactive element is?
Correct answer: B. 0.693/λ
- A. 0.693λ
- B. 0.693/λ
- C. λ/0.693
- D. 1/λ
Explanation
Nt = N0e-λt. N0 = initial quantity. Nt = quantity after time t . t = time period. λ = decay constant Nt = N0/2. t = t1/2. N0/2 = N0e-λt1/2. ½ = e-λt1/2. ln0.5 = -λt1/2. -0.693 = -λt1/2. t1/2 ="0.693/π".
Last updated
About Nuclear Physics
Atomic nuclei contain protons and neutrons, with nuclear size, mass defect and binding energy describing their stability. The work covers alpha, beta and gamma decay, decay equations, half-life and decay rate, along with radiation safety and medical applications such as imaging, radiotherapy and tracers.
Practise Nuclear Physics
1,254 free Nuclear Physics MCQs from Physics, each with the correct answer and an explanation. Unlimited attempts, no account needed.
Exams that ask Physics questions like this
Physics is on 13 papers prepared for on TestUstad, and all of them draw the same bank, so this question is worth knowing for every one of them.