The resolving power of an electron microscope operated at 16kV is R. The resolving power of the electron microscope when operated at 4kV is

Options

A. `(R )/(4)`
B. `(R )/(2)`
C. `4R`
D. `2R`

Answer

B

Explanation

Resolving power is proportional to inverse of wavelength,
i.e.,, `Rprop(1)/(lamda)`
and `lamdaprop(1)/(P)`
So, `Rpropp=sqrt(2mE)`
So, `RpropsqrtE`
`(R')/(R)=sqrt((4kV)/(16kV))=(1)/(2)`
`R^`=(R)/(2)`