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Silicon films become better electrical conductors when illuminated by photons with energies of 1.14 eV or greater, an effect called photoconductivity. Which of the following wavelengths of
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- The work function and cut-off frequency for platinum are 6.35 eV and 1.90 X 1015 ?? respectively. What is the maximum wavelength of light incident on platinum releases photoelectrons from the platinum’s surface? a) 188 nm b) 158 nm c) 168 nm d) 178 nmarrow_forwardThe work function of tungsten is 4.5 eV. What is the photoelectric threshold wavelength for tungsten? What type of radiation is this? h = 4.136 x 10-15 eV.s c = 3.0 x 108 m/sarrow_forwardI have a physics question as follows: An isolated copper sphere of radius 5.55 cm, initially uncharged, is illuminated by ultraviolet light of wavelength 247 nm. The work function for copper is 4.70 eV. What charge does the photoelectric effect induce on the sphere?arrow_forward
- A certain helium-neon laser pointer, emitting light with a wavelength of 632 nm, has a beam with an intensity of 715 W/m2 and a diameter of 2.70 mm. How many photons are emitted by the laser pointer every second? Thank you for the help!arrow_forwardTo remove the least tiny bound electrons from a metal surface, a 4.8 eV is needed. When ultraviolet photons of a single frequency strike the metal, the electrons were ejected whose kinetic energies are from zero to 3.6 eV. Compute the energy of the indent photons. A. 8.4 eV B. 4.3 eV C. 7.3 ev D. 6.8 eVarrow_forwardThe Sun emits light at many wavelengths across the Visible and Non-Visible Spectra, but the maximum Intensity wavelength it emits is at 499.7 nm. Does a photon of light at this wavelength have enough Energy to eject an electron from Sodium (Work Function = 2.28 eV) and give it enough Energy to move through a Potential Difference of 1 Volt?arrow_forward
- A strip of metal foil with a mass of 5.00 × 10-7 kg is suspended in a vacuum and exposed to a pulse of light. The velocity of the foil changes from zero to 1.00 × 10-3 m/s in the same direction as the initial light pulse, and the light pulse is entirely reflected from the surface of the foil. Given that the wavelength of the light is 450 nm, and assuming that this wavelength is the same before and after the collision, how many photons in the pulse collide with the foil?arrow_forwardWhat is the minimum wavelength in m of the x-ray photons from a 140 kV x-ray tube? (h = 6.63x10-34J·s, 1 eV = 1.6x10-19 J, c = 3.0x108 m/sarrow_forwardBarium has a work function of 2.48 eV. What is themaximum kinetic energy of electrons if the metal is illuminated by UV light of wavelength 365 nm? What is their speed?arrow_forward
- In a photoelectric experiment, a metal is irradiated with light of energy 3.56 eV. If a braking potential of 1.10 V is required, what is the work function of the metal? a) 0.644 eV b) 1.83 eV c) 2.64 eV d) 3.20 eV e) 4.66 eVarrow_forwardWhat is the longest wavelength of light that can cause photoelectron emission from a metal that has a work function of 1.80 eV? 690 nm 564 nm 555 nm 123 nm 4.35 X 10^14 marrow_forwardA visible (red) emission spectral line for cadmium (Cd) occurs at wavelength λ = 655.980 nm. What is the magnitude of the energy change associated with the emission of exactly three moles of photons of light with this wavelength?arrow_forward
- University Physics Volume 3PhysicsISBN:9781938168185Author:William Moebs, Jeff SannyPublisher:OpenStax