1. Intro to Physics Units

The cathode-ray tubes that generated the picture in early color televisions were sources of x rays. If the acceleration voltage in a television tube is 15.0 kV, what are the shortest-wavelength x rays produced by the television?

The photoelectric work function of potassium is 2.3 eV. If light that has a wavelength of 190 nm falls on potassium, find (b) the kinetic energy, in electron volts, of the most energetic electrons ejected

The photoelectric work function of potassium is 2.3 eV. If light that has a wavelength of 190 nm falls on potassium, find (a) the stopping potential in volts

What would the minimum work function for a metal have to be for visible light (380–750 nm) to eject photoelectrons?

The photoelectric threshold wavelength of a tungsten surface is 272 nm. Calculate the maximum kinetic energy of the electrons ejected from this tungsten surface by ultraviolet radiation of frequency 1.45 * 10^15 Hz. Express the answer in electron volts.

A photon has momentum of magnitude 8.24 * 10-28 kg # m>s. (b) What is the wavelength of this photon? In what region of the electromagnetic spectrum does it lie?

A laser used to weld detached retinas emits light with a wavelength of 652 nm in pulses that are 20.0 ms in duration. The average power during each pulse is 0.600 W. (a) How much energy is in each pulse in joules? In electron volts?

A photon of green light has a wavelength of 520 nm. Find the photon's frequency, magnitude of momentum, and energy. Express the energy in both joules and electron volts.

(a) The energy of the 2s state of lithium is -5.391 eV. Calculate the value of Zeff for this state.

(b) Estimate the energy of the least strongly bound level in the L shell of N2+.

(a) The doubly charged ion N2+ is formed by removing two electrons from a nitrogen atom. What is the ground-state electron configuration for the N2+ ion?

The energies of the 4s, 4p, and 4d states of potassium are given in Example 41.10. Calculate Zeff for each state. What trend do your results show? How can you explain this trend?

The 5s electron in rubidium (Rb) sees an effective charge of 2.771e. Calculate the ionization energy of this electron.

A hydrogen atom in a particular orbital angular momentum state is found to have j quantum numbers 7 2 and 9 2 . (b) If n = 5, what is the energy difference between the j = 7 2 and j = 9 2 levels?

Calculate the energy difference between the ms = 1 2 ('spin up') and ms = - 1 2 ('spin down') levels of a hydrogen atom in the 1s state when it is placed in a 1.45-T magnetic field in the negative z@direction. Which level, ms = 1 2 or ms = - 1 2 , has the lower energy?