Electrons made to vibrate to and fro at a few hundred thousand hertz emit radio waves. What class of waves is emitted from electron vibrations of a few million billion hertz

this frequency is in the near UV range

Explanation:

The accelerated movement of a charge creates an electromagnetic wave, the speed of the wave is the speed of light

         c = λ f

the emitted frequency is f = 10⁶ 10⁹ Hz = 10¹⁵5 hz,

light of this frequency is in the near UV range

given data:

determine the horse power (h.p) = ?

force applied to move the box(f) = 10 pounds,

box lifted from a distance         (d) = 3 feet

time taken to lift                         (t) = 10 sec,

the horse power is defined as amount of work required to move a load. the horse power is equal to 550 foot-pound per second

                  1 h.p   = 550 foot-pound/second

it can also be defined as the the load that need to be move a body for certain distance in a certain amount of time.

mathematically,

                      h.p = (force × distance)/ time

                            = (10 × 3)/ 10

                            = 30/10

                            = 3 foot -pound/sec

hence, the horse power is needed to move the box is 3 foot-pound/second

important note: 1 h.p = 550 foot-pound/second = 746 watts

not too sure thinking it will always be directed towards the centre of the earth. could be wrong not sure