nuclear

Question 1

what is the equation for intensity, using: P and A?
NUCLEAR

Answer 1

I = P / A

where:
• P = power
• A = area

Question 2

what is the equation for activity, using: λ and N?
NUCLEAR

Answer 2

A = λN

where:
• λ = decay constant (probability that any one atom will decay in one second)
• N = number of undecayed nuclei

Question 3

what is the equation for the number of undecayed nuclei in a sample, using: N, N0, λ and t?
NUCLEAR

Answer 3

N = N0e^(-λt)

where:
• N = number of undecayed nuclei in the sample at that time
• N0 = initial number of undecayed nuclei in the sample
• λ = decay constant
• t = time

Question 4

what is the equation for mass left in sample as time increases, using: m0, λ and t?
NUCLEAR

Answer 4

m = m0e^(-λt)

where:
• m0 = original mass
• λ = decay constant
• t = time

Question 5

what is the equation for activity in a sample as time increases, using: A0, λ and t?
NUCLEAR

Answer 5

A = A0e^(-λt)

where:
• A0 = initial activity when t = 0
• λ = decay constant
• t = time

Question 6

what is the equation for half-life, using: λ?
NUCLEAR

Answer 6

t1/2 = ln(2) / λ

where:
• t1/2 = the time taken for half of the undecayed nuclei in a sample to decay
• λ = decay constant