You can (regrettably) buy a handheld green “laser pointer” (more like “airplane pilot blindnessinducer”) that produces a 100 mW beam of light at 532 nm. How many photons per second doessuch a device produce
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You can (regrettably) buy a handheld green “laser pointer” (more like “airplane pilot blindnessinducer”) that produces a 100 mW beam of light at 532 nm. How many photons per second doessuch a device produce?
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- What is the speed of a beam of electrons (in SI units) that go undeflected when passing through crossed electric and magnetic fields of magnitude (5.07x10^0)x104 V/m and (4.270x10^0)x10-3 T, respectively? Give your answer to 3 sf.Suppose the 50 turn coil in the figure below lies in the plane of the page and originally has an area of 0.230 m². It is stretched to have no area in 0.100 s. X Bin XBin X V What is the direction? clockwise X counterclockwise X X What is the magnitude (in V) of the average value of the induced emf if the uniform magnetic field points into the page and has a strength of 1.75 T? X X 192 XNeutrinos are subatomic particles. The lowest mass neutrino has a mass of about 1.8 X 10-36 kg. You have captured one of these, and to study it, it can't have a speed greater than 1 cm/s. What is the smallest width of a one-dimensional box in which you can confine the neutrino? O 9.2 km O 4.6 mm О 1.8 т О 8.5 пт О 13.6 ст O 19.2 µm
- As you may well know, placing metal objects inside a microwave oven can generate sparks. Two of your friends are arguing over the cause of the sparking, with one stating that the microwaves "herd" electrons into "pointy" areas of the metal object, from which the electrons jump from one part of the object to another. The other friend says that the sparks are caused by the photoelectric effect. Prove or disprove the latter idea using basic physics. Suppose the typical work function of the metal is roughly 3.630 × 10-19 J. Calculate the maximum wavelength in angstroms of the radiation that will eject electrons from the metal. wavelength: ÅElectrons are ejected from a metallic surface with speeds ranging up to 4.1 × 105 m/s when light with a wavelength of 630nm is used. What is the cutoff frequency for this surface? Express your answer in terms of 1014 Hz and round it to the nearest hundredth. For example, if you get 1.234 x 1014 Hz, you type in 1.23. (Hint: you should first calculate the work function of the surface.) Use h=6.626x1034 Js; c=3 x108 m/s. ; me=9.11x10-31kg Js; c=3 x108 m/s. ; me=9.11x1031kg. Find the momentum of a photon in eV/c and in kg·m/s if the wavelength is (a) 400 nm, (b) 1 Å = 0.1 nm, (c) 3 cm, and (d) 2 nm.
- How fast must an electron be moving if all its kinetic energy is lost to a single x-ray photon with the following characteristics? (a) The photon has a wavelength of 3.55 x 10-8 m near the high end of the x-ray electromagnetic spectrum. Your response differs significantly from the correct answer. Rework your solution from the beginning and check each step carefully.c (b) The photon has a wavelength of 3.55 x 10-13 m near the low end of the x-ray electromagnetic spectrum,A rectangular metal plate measures 0.24 m long and 0.7 m wide. The plate is heated to a temperature of 1,533 K by passing a current through it. Assuming that it behaves like a blackbody, how much power does the plate radiate under these conditions?