Week 9 was mostly about the photoelectric effect. You measure the energy of electrons that are produced in a tube like the one we studied and find K = 2.8 eV. You then change the wavelength of the incoming light and increase it by 40%. What happens? Are the photoelectrons faster or slower? The kinetic energy now is 0.63 eV.

Acentrifuge in a medical laboratory rotates at an angular speed of 3,700 rev/min. when switched off, it rotates through 54.0 revolutions before coming to rest. find the constant angular acceleration (in rad/s2) of the centrifuge. your response is within 10% of the correct value. this may be due to roundoff error, or you could have a mistake in your calculation. carry out all intermediate results to at least four-digit accuracy to minimize roundoff error. rad/s2