Answer:
1. Battery
2. Copper wire
3. Nail or piece of metal (zinc, iron, or steel).
Light is refracted when it crosses the interface from air to glass in which it moves more slowly.
Since the light speed changes at the interface, the wave length of the light must change too. The wave length decreases as the light enter the medium and the light wave changes direction.
The AU ... Astronomical Unit ... used to be defined as the average distance between the Sun and Earth during the year.
Now it's defined as 149,597,870,700 meters exactly.
Answer:

Explanation:
Potential Energy= Kinetic Energy
Let
be the value of Kinetic Energy.
We know that

Make
the subject of the formula to get speed at the bottom of the hill.

DIAMONDS are NOT rocks. Diamonds are minerals, rocks are made up of many different fragments of minerals.