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A silver sphere of radius 1 cm and work function 4.7 eV is suspended from an insulating thread in free- space. It is under continuous illumination of 200 nm wavelength light. As photoelectrons are emitted, the sphere gets charged and acquires a potential. The maximum number of photoelectrons emitted from the sphere is A × 10 z (where 1 < A < 10). The value of ‘Z’ is ?

A silver sphere of radius 1 cm and work function 4.7 eV is suspended from an insulating thread in free- space. It is under continuous illumination of 200 nm wavelength light. As photoelectrons are emitted, the sphere gets charged and acquires a potential. The maximum number of photoelectrons emitted from the sphere is A × 10 z (where 1 < A < 10). The value of ‘Z’ is ?

Grade:11

1 Answers

Rupesh Nain
15 Points
5 years ago
When the potential of sphere becomes equal to the potential of emitting electron ,  the electron stops emitting from source.
 
 
       Therefore ,, . KQ/ R is the potential of sphere. 
        Q=ne
       Kne/R = 1.5
     n= 1.5*10^19/ 9*10^9 *16*10^2
     n= 1.04 * 10^ 7
 
 
 
 
 
 
        
       

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