Answer:

Explanation:
From the question we are told that:
Length 
Voltage 
Frequency 
Generally the equation for maximum Electric Field is mathematically given by



Answer:
The maximum mass is 
Explanation:
The wavelength of the electron can be determined by means of the De Broglie equation.
(1)
Where h is the Planck's constant and p is the momentum.
(2)
Where m is the mass and v is the velocity.
Before using equation 2 it is necessary to express the wavelength from femtometers to meters.
--
Finally, equation 2 can be used.
But 
Hence, the maximum mass is 
The static frictional force is greater than the kinetic frictional force, so the static frictional force is greater than 1200 N.