Minimum accelerating potential (volts) needed to accelerate an electron to produce a yellow line (lambda= 310 nm) in the spectrum , in an electron tube containing some vapours is :

Minimum accelerating potential (volts) needed to accelerate an electro

1.	Minimum accelerating potential (volts) needed to accelerate an electron to produce a yellow line (lambda= 310 nm) in the spectrum , in an electron tube containing some vapours is :
Answer» 1.2 4 `6.4 xx 10^(-19)` `2 xx 10^(-15)` ANSWER :B