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Predict/Calculate Light of frequency $8.22 \times 10^{14} \mathrm{Hz}$ ejects electrons from surface A with a maximum kinetic energy thatis $2.00 \times 10^{-19} \mathrm{J}$ greater than the maximum kinetic energy of electrons ejected from surface B. (a) If the frequency of the light is increased, does the difference in maximum kinetic energyobserved from the two surfaces increase, decrease, or stay thesame? Explain. (b) Calculate the difference in work function forthese two surfaces.

a) rem ains the sameb) $2.00 \times 10^{-19} \mathrm{J}$

Physics 103

Chapter 30

Quantum Physics

University of Michigan - Ann Arbor

Hope College

University of Winnipeg

McMaster University

Lectures

02:51

In physics, wave optics is…

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Interference is a phenomen…

05:10

Predict/Calculate Platinum…

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White light, with frequenc…

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Light of frequency $9.95 \…

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05:49

Electromagnetic waves, wit…

03:55

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$\bullet$ The photoelectri…

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Monochromatic ultraviolet …

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The maximum electron energ…

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The work function of potas…

But let's do part, eh? Frequency off light F is equal to 8.2 to multiply by tentative. All 14 hurts on dhe. We have a kinetic energy from surface A is equal to, uh, kinetic energy from surface B plus two point 00 multiplied by 10 to the power minus 19. This is according to the given problem, and this came to return is connected energy from surface A minus kinetic energy from service be equals two points. It is they don't multiply by 10 to the dollar minus 19 uh, tentative border minus 19 tools. Well, if the frequency off light is increased also, kinetic energy from surface A and kinetic energy from surface be changed by an equal factor and therefore, the difference This difference, uh, difference, uh, remains the same. Do friends remains, uh, the same, because if the frequency of flight is increased, kinetic energy from surface A and kinetic energy from surface be changed by an equal factor. Now let's sold part B. Well, um, work function off surface be equals H f minus kinetic energy from surface be and similarly work function off surface air equals H f minus, uh, kinetic energy from surfacing, and we have no work. W b minus to you, eh equals, um, kinetic energy from surface A minus kinetic energy from surface be and therefore w b minus tip. Okay, The difference in work functions is equal to the difference and kinetic energy and the difference in kinetic energy is equal to 100 multiplier intended it baller minus 19. Jules.

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