1.) the radio wave from a station broadcasting at 1.3×10^6 hz has a wavelength of 230 m. what is the wave's speed? 2.) a wave has a frequency of 575 hz. what is its period? 3.) a humming bird feeder is tied by a rope to a tree branch. you notice that in a gentle breeze, the feeder moves back and forth 15 times in 1 minute. how long is the rope?

a solenoid is created by wrapping a l = 90 m long wire around a hollow tube of diameter d = 4.5 cm.   the wire diameter is d = 0.9 mm.   the solenoid wire is then connected to a power supply so that a current of i = 9 a flows through the wire.

randomized variablesl = 90 m

d = 4.5 cm

d = 0.9 mm

i = 9 a                                          

write an expression for the number of turns, n, in the solenoid. you do not need to take into account the diameter of the wire in this calculation.

calculate the number of turns, n, in the solenoid.

write an expression for the length of the solenoid (l2) in terms of the diameter of the hollow tube d.

calculate the length of the solenoid (l2)   in meters.

calculate the magnitude of the magnetic field at the center of the solenoid in teslas.

explanation:

explanation:

newton's third law, for every action there is an equal and opposite reaction.