If you shine light with a wavelength of 153 nm on Potassium, what is the velocity of the electrons being emitted. Provide your answer in units of 105 m/s and round it off to two decimal places, i.e. the nearest hundredths.

What is the wavelength (in m) of a 2.06 eV photon? Find its frequency in hertz.

A metal alloy of unknown composition was bombarded with 186 nm photons to determine its photoelectric properties. Electrons photo-ejected from this alloy had a velocity of 8.00 × 10⁵ m/s. What is the work function, Φ, of this alloy in eV? (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.)

Gold has a work function, Φ, of 5.47 ev. If a sample of gold is bombarded with 175 nm photons, what will be the velocity (in m/s) 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.)

thanks. The work function of sodium is 2.3 eV. What is the longest wavelength that can cause photoelectric emission? What should be the stopping potential if the sodium atom is illuminated by light of λ = 400 nm?

Light of wavelength 350 nm falls on a potas- sium surface, and the photoelectrons have a maximum kinetic energy of 1.3 eV. What is the work function of potassium? The speed of light is 3 × 10° m/s and Planck's J.s. -34 constant is 6.63 × 10° Answer in units of eV. What is the threshold frequency for potas- sium? Answer in units of Hz.

In the typical X-ray lamp the electrons are accelerated in the potential difference of 10,100 V before hitting the water cooled electrode. Find the shortest wavelength of X-rays produced in this lamp. State your answer in 1010 m and round it to the nearest thousandth. For example, if you get 1.2453 × 10-10 m, you type in 1.245. Take h=6.626x10-34 J s; 1e =1.6x10-19C; c=3x10®m/s.

The photoelectric equation for the kinetic energy of a photoelectron is, following Einstein, E < hf – W, whereh is Planck's constant, f is the frequency of the light, and W is the work-function. Sodium has W = 3.2×10-19 J. When sodium is illuminated by monochromatic light of a particular frequency, electrons are emitted with speeds up to 8 x 105 ms-1. a) Calculate the wavelength of the light. b) Calculate the stopping potential.

So Determine the distance between the electron and proton in an atom if the potential energy ?U of the electron is 15.4 eV (electronvolt, 1 eV =1.6×10−19=1.6×10−19 J). Give your answer in Angstrom (1 A = 10-10 m)

If the radius of a calcium ion is 0.22 nm, how much energy does it take to singly ionize it? Give your answer in electron-volts (eV) with precision 0.1 eV. Give your answer to 2 significant digits.