Assume we have a material with a work function of 4.87 eV. What is the maximum speed, in meteres per second, of electrons ejected from this metal by photons of light with wavelength 85 nm?

A black body at 7 500 K consists of an opening of diameter 0.048 0 mm, looking into an oven. Find the number of photons per second escaping the opening and having wavelengths between 500 nm and 514 nm. photons/s

For a certain metal, the threshold wavelength for the photoelectric effect is 719.0 nm. What is the maximum velocity (in m/s) for ejected electrons when light with wavelength 441.0 nm shines on the metal?

A photon with wavelength X scatters off an electron at rest, at an angle with the incident direction. The Compton wavelength of the electron Ac = 0.0024 nm. a) For λ = 0.0006 nm and 0 = 53 degrees, find the wavelength X' of the scattered photon in nanometres. b) Obtain a formula for the energy of the electron Ee after collision, in terms of the universal constants h, c and the variables X, X' and Ac. The answer must be expressed in terms of these variables only. (Please enter an algebraic expression using latex format; do not input any numerical values) c) Using the energy conservation condition, find the value of the electron energy Ee after scattering in units of keV. d) Write an algebraic expression for the electron's momentum pe in terms of its energy Ee, its mass me and the speed of light c. e) What is the de Broglie wavelength of the scattered electron ? Express your answer in terms of Ee, me, and X and c. f) Find the value of the de Broglie wavelength of the scattered electron…

A parallel beam of 500-keV photons is normally incident on 0.8 cm sheet of lead (density = 11.4 g/cm³) at a rate of 2x10 photns/sec. µ/p = 0.16 cm²/g, Hen/p = 0.09 cm²/g, H/p = 0.11 cm²/g What is the fraction of photons transmitted without interaction? Choose. + What fraction of the transmitted energy is due to uncollided photons? Choose... What fraction of the initial kinetic energy transferred to the electrons is emitted as Bremsstrahlung? Choose...

A sheet of metal is illuminated by photons with a wavelength of 325 nm and the emitted electrons are found to have a maximum kinetic energy of 1.25 eV.  If the same metal is illuminated by 225 nm light, what will be the maximum speed of emitted electrons? Give your answer in km/s to 3 significant digits.

A) Astronomers measure the peak wavelength of a nearby star to be 410 nm. What is the star's temperature? B) How much energy does a single photon of light have at this wavelength? C) An electron bound in an unknown metal requires 1.45E-19 ] of energy under the photoelectric effect to become free of the metal. How much kinetic energy would it have if struck by the photon froft part (b)? D) What is the final speed of the elctron from part (c)?

| 1+ 19. An electron (mass m) with initial velocity i = voi + voj is in an electric field É = -E,k. If 1o is initial de-Broglie wavelength of electron, its de-Broglie wavelength at time t is given by do a. A = 1+ m2 t? b. A= 1+ t2 m²u λο c. A = 1+ t2 2m² v do d. A = 2+

Most microwave ovens emit electro-magnetic radiation with a wavelength () of 12.24 cm. This EM-radiation is used to heat stuff up, like food, and it is emitted at a rate of 6.30 × 1026 photons/second for a typical microwave. How long will it take to boil a 175.0 mL cup of water initially at 25.5 ºC (water boils at 100.0 ºC) if 45.0% of the photons emitted by the microwave oven are absorbed by the water? My answer does not even make any sort of rational sense...

A visible (violet) emission spectral line for chromium (Cr) occurs at wavelength λ = 425.435 nm. A) What is the frequency (ν) of this light?(Give correct units and answer to six significant figures.) B) What is the magnitude of the energy change associated with the emission of one mole of photons of light with this wavelength?