In Einstein's photoelectric experiment, the kinetic energy (K.E.) of an electron displaced from a metal by a photon was the difference in energy between the photon and a threshold energy value for the metal. If you were to perform a similar experiment with the metal gold, which has a threshold energy of 8.76 × 10⁻¹⁹ J, and ultraviolet light of wavelength 45.5 nm, what would be the speed (v) of the dislodged electron in meters per second? (K.E. = 1/2mv². The mass of the electron = 9.109 × 10⁻³¹ kg.)

Silver has a work function, Φ, of 4.64 eV. If a sample of silver is bombarded with 213 nm photons, what will be the wavelength (in meters) of the photo-ejected electrons? (1 eV = 1.60 × 10⁻¹⁹ J, the mass of an electron is 9.109 x 10⁻³¹ kg, and Planck's constant is 6.626 x 10⁻³⁴ Js.)

What wavelength of radiation has photons of energy 6.12×10−19 J ? Express your answer with the appropriate units.

A Li2+ ion absorbs a photon with a frequency of 6.66 x 10^14 Hz. If the energy of the final state of Li2+ was -7.85 x 10^19 J, calculate the energy of the initial state.

Calculate the wavelength(nm) of light that strikes a metal with a threshold frequency of 2.84 x 1014s-1 and ejects an electron with a kinetic energy of 5.48 x 10-19J.

2. A laser pointer used in the classroom emits light at 6550 A, at a power of 4.00 mW. (One watt is the SI unit of power, the measure of energy per unit of time. 1 W = 1 J/s). How many photons are emitted from the pointer in 115 seconds?

Pieces of potassium (Φ  = 3.68 ×× 10–19 J) and sodium (Φ  = 4.41 ×× 10–19 J) metal are exposed to radiation of wavelength 350.0 nm. What is the velocity of the electrons from sodium?

Thermal neutrons are neutrons that move at speeds comparable to those of air molecules at room  temperature. These neutrons are most effective in  initiating a nuclear chain reaction among 235U isotopes.  Calculate the wavelength (in nm) associated with a  beam of neutrons moving at 7.00 × 102 m/s (mass of  a neutron = 1.675 × 10-27 kg).

The work function (φ) for a metal is the amount of energy needed to eject an electron from the surface of the metal via the photoelectric effect. For nickel φ = 8.25 x 10-19J. Will a photon with a wavelength (λ) of 250.0 nm have enough energy to eject an electron from nickel?  If the speed of an electron in the n = 4 energy level of a hydrogen electron is 2.3 x 106 m/s, what is the de Broglie wavelength of this electron in nanometers (the mass of an electron is 9.10938 x 10-31 kg). Note: 1 ? = 1 ?? ∙?2 An F-15 Strike Eagle weighs in at roughly 32,000 kg fully loaded. If an F-15 Eagle is traveling at 3,017 kilometers per hour, what is the de Broglie wavelength associated with the aircraft at this speed in nanometers?

What is the change in energy of a photon emitted during a transition from n=6 to n=4 state in the H atom?