1.2. When a photoelectric cell with a copper cathode is illuminated by a Hg arc lamp, with wavelength 245 nm, the reverse potential across the cell (i.e. the voltage that just stops the fastest emitted electrons) is measured to be 0.181 V. Calculate the work function and threshold frequency of copper.

A quantum mechanical oscillator vibrates at a frequency of 250.0 THz. What is the minimum energy of radiation it can emit?

A 600-nm light falls on a photoelectric surface and electrons with the maximum kinetic energy of 0.17 eV are emitted. Determine (a) the work function and (b) the cutoff frequency of the surface. (c) What is the stopping potential when the surface is illuminated with light of wavelength 400 nm?

At what velocity will an electron have a wavelength of 1.00 m?

A 200-W heater emits a 1.5-m radiation. (a) What value of the energy quantum does it emit? (b) Assuming that the specific heat of a 4.0-kg body is 0.83kcaI/kg • K, how many of these photons must be absorbed by the body to increase its temperature by 2 K? (c) How long does the heating process in (b) take, assuming that all radiation emitted by the heater gets absorbed by the body?

1.3. A photoelectric cell has a cutoff wavelength, λc, of 262.7 nm. ☹ (a) What is the work function of the cell? (b) What current would be produced by the cell if the wavelength was increased to 300 nm? 400 nm? 500 nm? (c) What stopping voltage Vo would be required if the illuminating wavelength were to be reduced to 200 nm? (d) What would be the maximum kinetic energy of the photo-electrons in the case of 200 nm illumination? ¹February 28, 2024 1

During an experiment 8.8x1014 Hz light shines on a metal plate and the Photoelectric Effect occurs. It is determined that the stopping potential is 2.4 V. Determine the momentum (in N-s) a photon has at the given frequency & determine the cutoff frequency (fo).  p= fo=

In a photoelectric effect experiment, it is found that no current flows unless the incident light has a wavelength shorter than 359 nm nm. What stopping potential will be needed to halt the current if light of 225 nm falls on the surface? Express your answer with the appropriate units. μA 2.249 V Vo =

3.5. The threshold wavelength for photoelectric emission in Tungsten is 240 nm. What wavelength of light must be used in order that the emitted photoelectrons have a KE max of 1.2 eV.

A photoelectric experiment has a work function  = 6.35 eV. The minimum cutoff frequency is 1.53E15 Hz a.) Purple light (wavelength 420 nm)- the energy of the photon is ______ eV What is the kinetic energy? b.) Ultraviolet (wavelength 130 nm)- the energy of the UV photon is _______eV. What is the kinetic energy?