photo electric effect

AIEEE 2015 Forum › Optics questions › photo electric effect

a light of wavelength Î» is incident on a metal sheet of work function 2ev. The wavelength I varies with time as I=3000+40t., where I is in A and t is in sec.The power incident on the metal surface is 100W. the signal is switched on and off at a regular intervals of 2 mins & 1 mins respectively. . each time the signal is switched on wave length starts from 3000A . the efficiency of photoemission is 1%. (hc=12400ev)
1)Time after which the photo emission stops??
2)No. of photo beams emitted from beam in one hour??
3)variation of rate of emission Vs Time????

please do answer the questions...........
(or)
give trail ....... discussion is welcomed

#Physics #Optics

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4 Answers

1

vector ·2009-03-11 10:10:30

r u sure I is wavelength?

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1

chazi ·2009-03-11 10:15:54

yeah. sure.....!!!

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24

eureka123 ·2009-03-11 19:47:05

Is I really wavelegth????
plz someone explain..[2][2]

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1

chazi ·2009-03-12 10:03:11

I is a fluctuating wavelength varying with time!!!

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