Un haz de luz en el aire incide sobre la superficie de una placa de cuarzo fundido (n=1.46). Parte del haz entra al cuarzo, con un ángulo de refracción de 30° y otra parte se refleja ¿cuál es el ángulo de reflexión?. Solo escribe el numero, sin el símbolo de grado.

Asun-sized star will spend most of its lifetime as a: white dwarf red giant protostar main-sequence star

Electric field of the earth. the earth has a net electric charge that causes a field at points near its surface equal to 150 n> c and directed in toward the center of the earth. (a) what magnitude and sign of charge would a 60-kg human have to acquire to overcome his or her weight by the force exerted by the earth’s electric field? (b) what would be the force of repulsion between two people each with the charge calculated in part (a) and separated by a distance of 100 m? is use of the earth’s electric field a feasible means of flight? why or why not?

Wavelength of 125 meters is moving at a speed of 10 m/s. what is it's frequency?