By 1949 americans who lived within the range of a television stations in the country could watch tv, vastly changing the way that humans communicated with each other. what type of electromagnetic wave made tv technology possible? a) microwaves b) radio waves c) seismic waves d) infrared waves

In what direction does the medium move relative to the direction of the wave? explain.

Acar travels along a highway with a velocity of 24 m/s, west. the car exits the highway; and 4.0 s later, its instantaneous velocity is 16 m/s, 45° north of west. what is the magnitude of the average acceleration of the car during the four-second interval?

Red light strikes a metal surface and electrons are ejected. if violet light is now used with a 10% greater intensity, what will happen to the ejection rate (number of ejected electrons per second) and the maximum energy of the electrons? a) greater ejection rate; same maximum energyb) same ejection rate; greater maximum energyc) greater ejection rate; greater maximum energyd) same ejection rate; same maximum energye) none of the above answers are correct