The isotope, tritium, has a half-life of 15 years. Assume we have 12 kg of the substance. What will be the disintegration constant (in s^-1)?

The number of states in the He⁺ ion corresponding to the principle quantum number n = 5 are

How many radioactive atoms

are present in a sample that has an activity of 0.

An energy of 13.6 eV is needed to ionize an electron from the ground state of a hydrogen atom. Selecting the longest wavelength that will work from the those given below, what wavelength is needed if a photon accomplishes this task?

The half-life of ¹³¹I is 8.04 days. five days after it was prepared, its activity was 0.4 uCi. How many curies (in uCi) were initially prepared?

Calculate the binding

energy per nucleon (MeV/nucleon) for tritium, (

What angle does the orbital angular momentum make with the z axis of a hydrogen atom in the state n = 3, l = 2,m_e = -1?

What is the disintegration

energy (in MeV) associated with this spontaneous decay?

m_Ra

= 223.018502 u

m_Rn

= 218.005601 u

m_He

= 4.002 603 u

1 u = 1.66 x

10

An electron in a hydrogen

atom makes a transition from the

What value of wavelength is associated with the Lyman series for n = 2? (R_H = 1.097*10⁷ m^-1)