Consider the Bohr model for the hydrogen atom in its second ...

[Caiter2013]

Consider the Bohr model for the hydrogen atom in its second excited state.
 
  (a) Determine the binding energy (eV) of the electron.
  (b) What is the radius of the electron orbit, given that r1 = 0.0529 nm?
  (c) How far is it from the next higher excited orbit?

Question 2

The unstable isotope 234Th decays by  emission with a half-life of 24.5 days.
 
  The initial decay rate of the sample was 9.9  1013 Bq. (1 u = 1.6605 x 10-27 kg)
  (a) What mass of 234Th was initially present?
  (b) What is the decay rate after 68 days?

[marict]

Answer to Question 1

(a) 1.51 eV (b) 0.476 nm (c) 0.370 nm

Answer to Question 2

(a) 0.12 g (b) 1.4 x 1013 Bq

[Caiter2013]

Both answers were spot on, thank you once again

[marict]

Great! Please up vote