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Introduction to the Photoelectric Effect

1) Write down the equation which relates the energy of a photon to itsfrequency

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2) Write down the equation which relates thewavelengthof a light photon to its

frequency

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3) What is the energy of a photon with a frequency of 1.5 x 1014Hz?

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4) What is the energy of a photon of red light whose waelength is !00n"

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5) # photon can gie an electron the energy necessary just to escape the

surface of a metal. $his exact a"ount of energy is called the

----------------- function of the "etal.

#

6) $he diagra" shows an electron Aat the surface of a piece of zinc. # photon p

is stri%ing the electron. What will happen to the electronif the energy of the

photon is&

a' less than the wor% function of the "etal

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(' )xactly equal to the wor% function of the "etal

-------------------------------------------------------------------------------------------------------c' *reater than the wor% function of the "etal

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-

p

+inc surface

#

,

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!. hotons of equalenergy stri%e electon # at the surface of the "etal

and electron , /ust (elow the surface of the "etal. ,oth electrons are e/ected.

Which e/ected electron will hae the greater %inetic energy?

' 2se the relationship&

photon energy =

energy neee to escape metal surface ! "# of ejecte electron

# photon w/th an energy of 5 x 10-3 stri%es a "etal surface and causes an

surface electron to (e e/ected.. $he wor% function of the "etal is .4 x 10-3.

What is the "axi"u" %inetic energy that the e/ected electron can hae?

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