What is the symbol definition for average speed? (i. e the formula)

Charge is distributed along the entire x-axis with uniform density λ. how much work does the electric field of this charge distribution do on an electron that moves along the y-axis from y = a to y = b? (use the following as necessary: a, b, ε0, λ, and q for the charge on an electron.)

Name two kinds of practical electric pumps.

Why do atoms emit energy of only specific wavelengths