An electron microscope employs a beam of electrons to obtain an image of an object. What energy must be imparted to each of the electrons of the beam to obtain a wavelength of 0.100 Å? Obtain the energy in electron volts (eV) (1 Å = 10-10 m, 1 eV = 1.602*10-19 J)

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?

. Calculate the wavelength of the photons emitted during a transition from the n = 3 to n = 2 level of the H atom. In which region of the electromagnetic spectrum would you expect these photons to lie? [RH = 2.179x10-18 J, h = 6.626x10-34 Js, c = 2.998×108 m s-1] 9. Sketch an energy level diagram for the ground state of the Al atom including electrons. Label all atomic orbitals. Pay particular attention to sensible energy gaps between subshells. %3D

The electron in an (unbound) hydrogen atom (H(g)) is excited from the ground state to the n=3 state.Which of the following statements are true and which are false. 1. it takes less energy to ionize the electron from n=3 than it does from the ground state.2. The wavelength of the light emitted when the electron returns to the ground state from n=3 is the same as the wavelength of light absorbed to go from n=1 to n=3.3. the electron is farther from the nucleus on average in the n=3 state than in the ground state.4. The first excited state corresponds to n=3.5. The wavelength of light emitted when the electron drops from n=3 to n=2 is shorter than the wavelength of light emitted if the electron falls from n=3 to n=1.

Determine the energy, in J, of a photon with a wavelength of 351 nm. (h = 6.626 × 10⁻³⁴ J • s and c = 3.00 × 10⁸ m/s)

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

If a laser emits 5.0 x 1019 photons per second and transfers a total of 80.58 J of energy over 2.06 seconds, what is the wavelength of the emitted light in nm?

Determine the energy of a photon with a wavelength of 317 nm. (h = 6.626 × 10⁻³⁴ J • s and c = 3.00 × 10⁸ m/s)

A silicon (Φ = 7.77 × 10-19 J) surface is irradiated with UV radiation with a wavelength of 195 nm. Assume an electron was a mass of 9.11 x 10-31 kg. What is the frequency of incident radiation?  What is the speed of emitted electrons?  What is the kinetic energy of emitted electrons?  What is the wavelength of the emitted electrons?