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hf =  + (1/2) mv2 and hf =  + eVs   work fucntion...

hf =  + (1/2) mv2 and hf =  + eVs   work fucntion
e = 1.60 x 10-19 C,
h = 6.63 x 10-34 J s,

m- mass of electron = 9.11 x 10-31 kg

1. The work function for lithium is 4.6 x 10-19 J.

(a) Calculate the lowest frequency of light that will cause photoelectric emission.

(b) What is the maximum energy of the electrons emitted when a light of 7.3 x 1014 Hz is used?

2. The stopping potential when a frequency of 1.61 x 1015 Hz is shone on a metal is 3 V.

(a) What is energy transferred by each photon?

(b) Calculate the work function of the metal.

(c) What is the maximum speed of the ejected electrons?

3. Selenium has a work function of 5.11 eV. What frequency of light would eject the electrons? (The threshold frequency is when the max KE of the ejected electrons is zero)

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