If the average frequency of light coming from a 60 Watt light bulb is 6*10^14 Hz, how many photons stream out from the bulb each second?

A certain X-ray machine generates X-rays from a beam of electrons accelerated from zero to 99.9999999 per cent the speed of light in a long linear accelerator of length 3.2 km. The electrons are generated in pulses of duration ∆t = 100 fs. The generated x-rays from the target are also short pulses (λ = 0.15 nm). Determine the energy of a single x-ray photon in the beam. a.) 8.27 eV              b.) 8.27 J                           c.) 8.27 keV                     d.) none of these.

Q1. A parallel beam of 1-MeV photons is normally incident on a sheet of uranium, 1.0 mm thick. The incident beam intensity is 104 MeV/ cm s. a) Calculate the energy fluence rate transmitted by the sheet. b) What fraction of the transmitted energy fluence rate is due to uncollided photons? c) What physical processes are responsible for energy transfer to the sheet? Given (µen/p)= 0.05 cm²/g p= 18.79 g/cm'.

A positron and an electron with negligible kinetic energy meet and annihilate one another, producing two y-rays of equal energy. the wavelength of these y-rays is ..···. O 2.428 pm O 14.28 Á O 4.822 pm O 1.428 pm

An electron within the hydrogen atom is excited from n1 to n4. The electron then "falls" back to ni in two steps (n4 -> n2, n2 -> n1). Which of the following statements is true about the light emitted during this process? One photons will be emitted. Two photons will be emitted. O Three photons will be emitted. Four photons will be emitted.

Suppose photons are produced in a cathode ray tube (CRT) from electrons which are accelerated across a potential of 22 kV. Energy in electron volts of the photons is 22000. what is the maximum frequency, in hertz, of these photons?

A recent study found that electrons that have energies between 3.45 eV and 20.5 eV can cause breaks in a DNA molecule even though they do not ionize the molecule. If a single photon were to transfer its energy to a single electron, what range of light wavelengths could cause DNA breaks? minimum wavelength: radio In which part of the electromagnetic spectrum does this light lie? O ultraviolet infrared nm gamma ray maximum wavelength: nm

You set up a photoelectric experiment with an unknown metal to eject electrons. You use light of wavelength λ = 660 nm, which just BARELY ejects electrons from the metal. Planck s constant is either h = 6.63 x 10-34 J.s or h = 4.14 x 10-15 ev.s. a) What is the binding energy of the unknown metal in eV? eV b) You change the light source to one with a wavelength of λ = 300 nm. Using the binding energy you found in the previous step, find the maximum kinetic energy of an electron that is ejected from the metal in Joules. c) What is the stopping voltage for an electron with the kinetic energy you just found? Submit Answer