What is the central idea of How far away is that lightning? A: The higher able to count between when you see lighting in here thunder, the safer it is to go outside to witness that event in nature.
B: counting how many seconds pass between when you see learning in here thunder can tell you how far away it is because sound and light travel at different speeds.
C: wow light and fan usually travel the same speed the light from lightning strikes is so fast so we stuck with the process it and end up processing sound first.
D: The widely held beliefs that you can calculate the distance of lightning by counting and that lightning doesn’t strike twice are actually supported by science.

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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:

i would say b. good luck!

i believe it is b, but i could be wrong. im pretty sure im right tho. ; )