when observed from earth, the wavelengths of light emitted by a star are shifted toward the red end of the electromagnetic spectrum. this redshift occurs because the star is

1. how to locate the image in converging(concave) mirror and diverging (convex) mirror with salt. 2. how to locate the image in a converging (convex) lens and diverging (concave) lens with salt.

If the specific heat of a metal is 0.850 j/g °c, what is its atomic weight?

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