Which of the following statements is true? a. radiant energy is the same as sound waves. b. radiant energy is a form of potential energy only. c. radiant energy does not serve any useful purpose. d. radiant energy does not require a medium through which to travel. reset

Write the correct abbreviation for each metric unit

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?

Amajor difference radio waves, visible light, and gamma rays is the of the photons, which results in different photon frequencies and wavelengths