PLEASE HELP ASAP What is the frequency of light that is at the peak of the suns radiation spectrum which carries an energy of 1.33 eV? Planck's constant is 6.634*10^-34 Js and the conversion factor from eV to J is 1.60*10^-19. Answer in scientific notation with 3 significant figures.

Athin nonconducting rod with a uniform distribution of positive charge q is bent into a circle of radius r. the central perpendicular axis through the ring is a z-axis, with the origin at the center of the ring. a) what is the magnitude of the electric field due to the rod at z = 0? n/c (b) what is the magnitude of the electric field due to the rod at z = infinity? n/c (c) in terms of r, at what positive value of z is that magnitude maximum? r (d) if r = 4.00 cm and q = 9.00 µc, what is the maximum magnitude? n/c

Two point charges are separated by a certain distance. how does the strength of the electric field produced by the first charge

When doing scientific research ,the sources used should be ?