Calculate the number of photons of light with a wavelength of 3000 pm that provide 2 J of energy.

Titanium (Φ = 6.94 ×× 10–19 J) and silicon (Φ = 7.77 ×× 10–19 J) surfaces are irradiated with UV radiation with a wavelength of   243 nm.  What is the wavelength of the electrons emitted by the titanium surface?

A laser pointer used in the classroom emits light at 4950 Å, 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?

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.

Determine the wavelength of light (in nm) emitted when an electron in the hydrogen atom transitions from 5 to nf = 1. [Give your answer as a whole number]

Calculate the wavelength of light with energy1.32 × 10−23 J per photon?

What is the wavelength (in nm) of the photon emitted when the electron in a single-electron lithium atom in an excited state makes the transition from the n=7 state to the n=3 state?

What is the wavelength of the electromagnetic radiation emitted from a hydrogen atom when the electron undergoes the n=5 transition n=3 to ?

A hydrogen atom absorbs a photon with a wavelength of 1094 nm and causes an electron to make a transition from an unknown n1 to a final n2 = 6.   Part A Calculate frequency of the absorbed photon in units of s-1.       Part B Calculate the energy change in the atom (ΔEatom in J) upon absorption of the photon.     Part C Calculate the value of n1