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Ejecting Electrons with Light
The minimum frequency of light needed to eject electrons from a metal is called the threshold.
Find the minimum energy needed to eject electrons from a metal with a threshold frequency of 3.27*10^14s^-1.
With what kinetic energy will electrons be ejected when this metal is exposed to light with a wavelength of lamda = 245 nm?
KE_electron = _________ J
HINT:Energy is related to frequency via E = hv.
The energy of the ejected electron is the difference between the minimum required energy and the energy of the light. You're given the wavelength of the light (lambda = 245 nm) which you'll need to convert to energy using E = hc/lambda.
Recall that h is Planck's constant (h = 6.626*10^-34 J*s) and c is the speed of light (c=2.998*10^8 m/s).
Compute the molecular formula of CH 3 COOH the percent composition of acetic acid is 39.99% C and 6.73% H. The remainder of the compound is oxygen.(The molar mass of acetic acid is 60.06 g/mol.)
Assume a wind turbine with a hub 50 meters above the ground, a rotor diameter of 75 meters and a wind-conversion efficiency of 25 percent.
Find the value of Pressure - How much more pressure will the gas exert if the temperature is raised to 44.1°C?
Write the overall reaction, showing how much ATP (Adenosine tri phosphate) can be produced per pentose used also write an equation for the generation of NADPH using ribose as a sole source of carbon?
How much energy (heat) is released when 1.52 moles of H2 reacts with 0.68 moles of Cl2 to create HCl(g) if the ΔHrxn = -184.6 kJ.
At some temperature, a chemist found the following equilibrium concentrations. [Fe3+] = 6.63 10-3 M, [SCN-] = 7.36 10-3 M, [FeSCN2+] = 4.34 10-2 M
A bottle of nail polish remover contains 182 mL of acetone, how much heat would be released by its complete combustion? The density of acetone is 0.788mL.
Suppose that the solvent ethanol could serve to replace the methanol in this process, but at the expense of double the concentrations of the solvent in the atmosphere.
"The chains of several cell membrane - bound proteins are known to wind back and forth through the cell membrane, such that some parts of the protein structure are extracellular, some parts are intracellular, and some parts lie within the cell mem..
Determine the partial pressures of each of the reactants CH4 O2 NO in the flask and the partial pressures and of each of the products and the total pressure in the flask
You are given some reactions as a. Cl2(aq) + 2NaI(aq)= I2(aq) + 2 NaCl(aq), b. Br2(l) + 2K(S)=2KBr(s), c. Pbs( s) + 4H2O2(aq)= PbSO4(s) + 4H2O(l) you just need to Indicate which element is reduced and which is oxidized in the given equations?
Use this information to compare how long it will take to obtain molecular scale mixing of such a gas over i) distance 1*10^-4 m and ii) 10m
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