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- A photoemissive material has a threshold energy, Emin = 5 1019 J. Will 300. nm radiation eject electrons from the material? Explain.arrow_forwardConsider burning ethane gas, C2H6 in oxygen (combustion) forming CO2 and water. (a) How much energy (in J) is produced in the combustion of one molecule of ethane? (b) What is the energy of a photon of ultraviolet light with a wavelength of 12.6 nm? (c) Compare your answers for (a) and (b).arrow_forwardAn FM radio station broadcasts at a frequency of 101.3 MHz. What is the wavelength, in meters and nanometers, of this radiation?arrow_forward
- 1) Energy dispersive x-ray spectroscopy (EDX) is a commonly used characterization technique in Materials Science to determine the elemental composition of materials. To do this, EDX measures the emitted characteristic x-rays from materials (e.g. Ka), generated due to the excitation of electrons from a lower energy shell to a higher energy one. Assume that you are working as a Materials Engineer in a company that produces cars. Your company has purchased 1 ton of Cr-Fe-Cu alloy to fabricate a certain part of the car. Your boss asks you to determine whether the material your company purchased is, in fact Cr-Fe-Cu alloy. If it there is another element present in the material, you will return the purchased material and stop production. So, you perform EDX analysis on your material and you see that three x-ray energies are detected: 5416, 6406 and 8050 eV. Determine which elements are present in your material and decide whether you should send the purchased material back or continue…arrow_forwardThe power output of a laser is measured by its wattage, that is, the number of joules of energy it radiates per second (1 W= 1 J s-1). A 10-W laser produces a beam of green light with a wavelength of 520 nm (5.2 × 10-7m).(a) Calculate the energy carried by each photon.(b) Calculate the number of photons emitted by the laserper second.arrow_forwardThe net change during photosynthesis involves CO2 and H2O forming glucose (C6H12O6) and O2. Chlorophyll absorbs light in the 600–700 nm region. (a) Write a balanced thermochemical equation for formation of 1.00 mol of glucose. (b) What is the minimum number of photons with λ = 680. nm needed to form 1.00 mol of glucose?arrow_forward
- The distance to the North Star, Polaris, is approximately 6.44 × 1018 m. (a) If Polaris were to burn out today, how many years from now would we see it disappear? (b) What time interval is required for sunlight to reach the Earth?(c) What time interval is required for a microwave signal to travel from the Earth to the Moon and back?arrow_forwardIn photoelectron spectroscopy, an electron is ejected from an atom by the collision of a UV photon with the surface of the atom. The equation describing this reaction is similar to the photoelectric effect described by Einstein: hv = ½ mv + Ei, where E; is the ionization energy of the atom. In one experiment on potassium, the kinetic energy of the ejected electron was 5.34 x 10ºJ when the UV source had a wavelength of 162 nm. Calculate the ionization energy of potassium. -19arrow_forwardThe power output of a laser is measured by its wattage, the number of joules of energy it radiates per second (1 W = 1 J s-1). A 1.70-W argon laser produces a beam of green light with a wavelength of 514.5 nm (5.145×10-7 m).(a) Calculate the energy carried by each photon. (b) Calculate the number of photons emitted by the laser per second. a) ______ J per photon b) _______ photons per secondarrow_forward
- Planck's constant h = 6.6256 x 10-34 J-sec; speed of light c = 2.9979 x 108 m/s For electromagnetic radiation with a wavelength of 376.6 nm: (a) What is the frequency of the radiation (in s-')? (b) What is the energy (in J) of one photon of the radiation? (c) What is the energy (in kJ) of one mole of photons of the radiation? 1.arrow_forward(a) Calculate the energy of a single photon of light with a frequency of 6.63x10¹¹ s¹. Energy = J (b) Calculate the energy of a single photon of orange light with a wavelength of 644 nm. Energy = Jarrow_forwardlast three subpartsarrow_forward
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