True because all switches use contacts to start or stop the flow of electrons in a circuit
<span>Objective Lenses: Usually you will find 3 or 4 objective lenses on a microscope. They almost always consist of 4X, 10X, 40X and 100X powers. When coupled with a10X (most common) eyepiece lens, we get total magnifications of 40X (4X times10X), 100X , 400X and 1000X.</span>
Sound pressure decreases with distance, so there's less sound pressure acting on your ear-drum.
In finding the distance that covers we simply add the three km which is
12 + 4 + 1 = 17km
17 km is the distance they cover.
We are going to use the displacement formula which is
d = vt + 1/2 at^2
d = 11.7 km
11.7 is the displacement
