The half-life of a radioactive material is 4.5 days. How many days are required for a sample, with an initial activity of 1.0 105 Bq, to decay to an activity of 100 Bq?
A) 45 days
B) 36 days
C) 54 days
D) 31 days
Question 2
What frequency must a photon have to change the energy of a hydrogen atom from the n = 2 to the n = 4 state? (h = 6.626 10-34 J s, 1 eV = 1.60 10-19 J)
A) 3.06 1014 Hz
B) 6.16 1014 Hz
C) 4.11 1014 Hz
D) 5.20 1014 Hz
E) 9.24 1014 Hz