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The max wavelength of radiation that can produce photoelectric effect in a certain metal is 200 nm. The max kinetic energy acquired by electron due to radiation of wavelength 100 nm will be? 1. 12.4ev2. 6.2 ev

The max wavelength of radiation that can produce photoelectric effect in a certain metal is 200 nm. The max kinetic energy acquired by electron due to radiation of wavelength 100 nm will be? 1. 12.4ev2. 6.2 ev

Grade:12th pass

5 Answers

Adarsh
768 Points
6 years ago
The answer will be 12.4ev .. 
Energy of wavelength (200-100) will give kinetic energy to electrons ..
so, Max. K.E= 12400/1000 = 12.4ev
Arun
25750 Points
6 years ago
Dear Kanika
 
Kmax = 12375 [1/1000  -  1/2000]
 = 6.2 ev
 
Hope it helps, in case of any query please feel free to ask
 
Regards
Arun (askIITians forum expert)
kanika
10 Points
6 years ago
By putting what values you got 12375 in this? Please explain......... I was not able to get this value.
Krishangi
15 Points
5 years ago
12375 is the value of hc
as KE=h√-h√° 
=> KE= hc/1000 A° - hc/2000A°
KE = hc(1/1000- 1/2000)
KE = 12375(1/1000-1/2000)
KE=6.2 
as hc=12375
Kushagra Madhukar
askIITians Faculty 628 Points
3 years ago
Dear student,
Please find the solution to your problem.
 
Kmax = 12375 [1/1000 – 1/2000]
 = 6.2 eV
 
Thanks and regards,
Kushagra

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