HARD
Diploma
IMPORTANT
Earn 100
Plutonium decays into uranium by alpha decay. The energy of the alpha particles takes four distinct values: 4.90MeV, 4.86MeV, 4.76MeV and 4.60MeV. In all cases a gamma ray photon is also emitted except when the alpha energy is 4.90MeV. Use this information to suggest a possible nuclear energy level diagram for uranium.
Important Questions on Quantum and Nuclear Physics (HL)
HARD
Diploma
IMPORTANT
The diagram shows a few nuclear energy levels for
Identify the four indicated transitions.
MEDIUM
Diploma
IMPORTANT
Find the decay constant for krypton-92, whose half-life is 3.00s.
HARD
Diploma
IMPORTANT
Suppose that you start with 1/100 mole of krypton. Estimate how many undecayed atoms of krypton there are after 1s,2s, and 3s. Decay constant is 0.231 1/s.
HARD
Diploma
IMPORTANT
State the probability that a radioactive nucleus will decay during a time interval equal to a half-life.
MEDIUM
Diploma
IMPORTANT
Calculate the probability that it will have decayed after the passage of three half-lives.
MEDIUM
Diploma
IMPORTANT
A nucleus has not decayed after the passage of four half-lives. State the probability it will decay during the next half-life.
HARD
Diploma
IMPORTANT
Estimate the activity of 1.0g of radium-226 . The half-life of radium-226 is 1600yr.
MEDIUM
Diploma
IMPORTANT
The half-life of an unstable element is 12 days. Find the activity of a given sample of this element after 20 days, given that the initial activity was 3.5MBq.
