Will therefore have less energy when red light is used. Red light is composed of photons that have a lower frequency and thus less energy than blue photons. Produces more photoelectrons, but they have the same energy distribution as before. The average kinetic energy of the emitted photoelectrons depends only upon the frequency of the light. [Graph of spectral power emitted by the T = 5800 K Sun in terms of The bluer the light, the hotter the object! An object that glows blue or bluish-white is hotter than an object that glows white. Bar graph B depicts theĬoncentrations at equilibrium, after a long time (each ion uniformly distributed throughout the The diffusion rate for Na + will be twice as fast asįor K + because its concentration gradient is twice as large. Rank in order,įrom largest to smallest, the maximum kinetic energy of the photoelectrons from A, B, and C. Ultraviolet photons of energy 8.0 eV shine on all three metals, creating photoelectrons. The work functions for metals A, B, and C are 3.0 eV, 4.0 eV, and 5.0 eV, respectively. Find the frequency at which the Earth emits radiation most strongly, and report the corresponding wavelength. The average surface temperature of the Earth is 288 K. What maximum wavelength (minimum energy) light will produce photoelectrons from this surface? Light with a wavelength of λ = 625 nm is used. When a red light is used the maximum KE of the photoelectronsĮlectrons are ejected from a metallic surface with speeds ranging up to If the light is made twice as bright, what happens to the averageīlue light shines on a metal, producing photoelectrons. Light striking a clean metal produces photoelectrons. What is the peak frequency of the EM radiation issuing from the pupil of the human eye, assuming an eye temperature of 37☌? Stars emit light according to their temperatures. Which of the following bar graphs show the concentrations a short time
Picture of the initial conditions above, as well as a bar graph showing the initial concentrations onĮach side of the container. The diffusion coefficients for each ion are the same. The concentration of Na + is 20 mmol/L on the left side, and there is 10 mmol/L of Sodium and potassium ions in solution occupy identical volumes that are separated by a removableīarrier. Read textbook section 30-5 before the next lecture use algebra to find the maximum kinetic energy K max of photoelectrons, photon energy E, or work function W 0 for a metal when any two of these quantities is given.use algebra to find the photon energy E or frequency ƒ when any one of these quantities is given.describe how the results of photoelectric effect experiments led to the photon theory of light.use algebra to find the frequency emitted most strongly ƒ peak or temperature T for a blackbody when any one of these quantities is given.explain how the blackbody radiation spectrum led to the understanding that energy is quantized.describe the changes in the total energy emitted by a hot object and the frequency of the radiation it emits most strongly as the temperature of the object increases.A student who masters the topics in this lecture will be able to:
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