Answer: The ends of a magnet are called the poles. Each magnet has a north pole and south pole.
Because there is no record of all things. As we have partially unknow information, it can never be held as a fact.
Answer:
Increase
Explanation:
The best way for me to visualize the relation between wavelength, frequency, and energy is to think about actual ocean waves. Wavelength is a measure of the distance between two equivalent points on consecutive waves (think wave peak to wave peak). Lets say you are building a sand castle and want to see how many waves hit your castle over a period of 10 seconds. If the distance between each wave is 10 ft and the wave is traveling at 1 foot per second then you will only have one wave hit your castle. If the wavelength is 1/2 that (5 ft) then you will have 2 waves hit your castle in the same amount of time. This is the same concept behind waves in physics. The smaller the distance between each wave, the more waves and therefore more energy that will be delivered.
Answer:
Explanation:
Check the attachment for solution
Use the relation between electric force and electric field and the concept of gravitational force to calculcate the electric field. The electric force is given by
And the gravitational force is
For the ball to float above the ground, the magnitude of electric force on the ball must be equal to the magnitude of the gravitational force. That is must be a equilibrium condition, so,
Replacing the values we have that,
Therefore the electric field magnitude that would cause the ball to float above the ground is 
