Taught intro physics and quantum mechanics
What is the thinnest film of a coating with $n$ = 1.42 on glass ($n$ = 1.52) for which destructive interference of the red component (650 nm) of an incident white light beam in air can take place by reflection?
(a) Calculate the change in entropy when 1.00 kg of water at 100$^\circ$C is vaporized and converted to steam at 100$^\circ$C (see Table 17.4). (b) Compare your answer to the change in entropy when 1.00 kg of ice is melted at 0$^\circ$C, calculated in Example 20.5 (Section 20.7). Is the change in entropy greater for melting or for vaporization? Interpret your answer using the idea that entropy is a measure of the randomness of a system.
A small button placed on a horizontal rotating platform with diameter 0.520 m will revolve with the platform when it is brought up to a speed of 40.0 rev/min, provided the button is no more than 0.220 m from the axis. (a) What is the coefficient of static friction between the button and the platform? (b) How far from the axis can the button be placed, without slipping, if the platform rotates at 60.0 rev/min?
A 70-kg person rides in a 30-kg cart moving at 12 m/s at the top of a hill that is in the shape of an arc of a circle with a radius of 40 m. (a) What is the apparent weight of the person as the cart passes over the top of the hill? (b) Determine the maximum speed that the cart can travel at the top of the hill without losing contact with the surface. Does your answer depend on the mass of the cart or the mass of the person? Explain.
(II) Estimate how the damping constant changes when a car's shock absorbers get old and the car bounces three times after going over a speed bump.
(II) What is the total charge of all the electrons in a 15 -kg bar of gold? What is the net charge of the bar? (Gold has 79 electrons per atom and an atomic mass of 197 u.)
A certain substance has a half-life of 9 hours. How many nuclei of the substance are required to give an initial activity of 6 ?Ci? 1 Ci = 3.7 × 1010 Bq
Please solve q2,3,4,5,6, 7, 8,9, 10, 11, 12, 13. Please explain solution in detail
A 2.50 -W beam of light of wavelength 124 nm falls on a metal surface. You observe that the maximum kinetic energy of the ejected electrons is 4.16 $\mathrm{cV}$ . Assume that each photon in the beamejects a photoelectron. (a) What is the work function (in electron volts of this metal? (b) How many photoelectrons are ejected eachsecond from this metal? (c) If the power of the light beam, but notits wavelength, were reduced by half, what would be the answer to part (b)? (d) If the wavelength of the beam, but not its power, were reduced by half, what would be the answer to part (b)?
