Atomic and Nuclear Physics Answers

Calculate ionization potential and first excitation potential of the hydrogen

atom taking ℎ = 6.62 x 10−34𝐽𝑠, 𝑒 = 1.6 x 10−19

, 𝑚 = 9.1 x 10−31𝑘𝑔.

Find the power dissipated in:

(i) an extension cord having a 0.06 Ω resistance, through which 5.00 A is flowing.

(ii) a cord utilizing thinner wire, with a resistance of 0.300 Ω.

A nuclear fission reaction is defined to be a process in which a large nucleus divides into two

roughly equal parts.

(i) What is the potential at a distance of 4.50×10–14 m from one of the parts that has 53 protons in it?

(ii) What is the potential energy in eV of a similarly charged part at this distance?

A 145 gram sample of a certain radioactive isotopes had a half-life of 500 years. If 4 half-lives go by, how much of the original isotope is left?

Electricity costs $0.10 per kilowatt-hour. How does it cost a family each year if they use 250 kilowatt-hours per month?

Yogi Bear’s class of 18 students used 270 kilowatt-hours of energy last week. What is the per capita energy usage in kilowatt-hours?

A sample of thallium-208 has a half-life of 3.053 minutes. What fraction of the parent material will remain after 12.212 minutes?

A 200 N net force acts on a 50 kg box. What is the acceleration of the box?

When a thin foil is bombarded with a particles, a few of them are scattered back toward the source. Rutherford concluded from this that the positive charge of the atom—and also most of its mass—must be concentrated in a very small “nucleus” within the atom. What was his line of reasoning?

How is the energy of a photon dependent on the frequency and wavelength? Based on that, how many photons are emitted in a nitrogen gas laser pulse with a wavelength of 337 nm and energy of 3.83 mJ?