If a photon of light leaves the sun than reachers the earth 494 second later. what is the distance from the earth to sun

Speed of light = 3 x 10⁸ m/s

Time to make the trip = 494 sec

Distance = (speed) x (time)

Distance = (3 x 10⁸ m/s) x (494 s)

Distance = 1,482 x 10⁸ meters

Distance = 1.482 x 10¹¹  meters

Distance = 1.482 x 10⁸  kilometers

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: