What must be the velocity of a beam of electrons if they are to disply a de Broglie wavelength of 100 Å (mass of electron = 9.1 xx 10^(-31) kg, h = 6.6 xx 10^(-34) J s)?

What must be the velocity of a beam of electrons if they are to disply

1.	What must be the velocity of a beam of electrons if they are to disply a de Broglie wavelength of 100 Å (mass of electron = 9.1 xx 10^(-31) kg, h = 6.6 xx 10^(-34) J s)?
Answer» SOLUTION :`7.25 xx 10^(4) ms^(-1)`