Electron coming out of a material has a velocity of 5.6x105 ms-1 when it is illuminated by a light of 3.45x1014 Hz. What is the material's work function?
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- Find the energy of the following. Express your answers in units of electron volts, noting that 1 eV = 1.60 × 10-1⁹ J. (a) a photon having a frequency of 4.20 x 10¹7 Hz ev (b) a photon having a wavelength of 4.60 x 10² nm eVA photon of wavelength 1.50 × 10-10 m is scattered at an angle of 90° in the Compton effect. The wavelength of the scattered photon is O 1.49 × 10-10 m O 1.50 × 10-10 m O 1.48 × 10-10 m O 1.51 x 10-10 m O 1.52 x 10-10 mAn ultraviolet light source produces photons with 8.5 eV of energy. What is the wavelength of thelight?
- |In a photoelectric effect experiment, the frequency of photons bombarding the surface is increased until photoelectrons just start to leave the surface. If this occurs at a frequency of 6.0 x 1014 Hz, what is the work function of the surface?Electrons 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=9.11x1031kgA photon has momentum of magnitude 2.48 x 10-28 kg.m/s. (a) What is the kinetic energy of this photon? (b) What is the wavelength of this photon? (c) In what region of the electromagnetic spectrum does it lie?
- 4. In an experiment on the photoelectric effect, a metal is illuminated by visible light of different wavelengths. A photoelectron has a maximum kinetic energy of 0.9 eV when red light of wavelength 640 nm is used. With blue light of wavelength 420 nm, the maximum kinetic energy of the photoelectron is 1.9 eV. Use this information to calculate an experimental value for the Planck constant h. [What are the energy and momentum of a photon of red light of wavelength 620 nanometers (nm)? What is the wavelength (in nm) of photons of energy 2.40 eV?What is the energy of a photon if it's frequency is 1.00s-1?