The sun casts a shadow 10 feet 6 inches away from the base of a flagpole. You measured the angle from the tip of the shadow to the top of the flagpole at 68 degrees.
How tall is the flagpole

it takes about 30 days for it to break down

spectral lines lyman is one set

adding a(n) to an electric circuit would increase the magnetic field around a wire;

b. solenoid

a solenoid is a type of electromagnet whose purpose is to generate a controlled magnetic field.

if the purpose of the solenoid is instead to impede changes in the electric current, a solenoid can be more specifically classified as an inductor rather than an electromagnet.

frequency or wavelenth of em radiation in a vacuum