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Outline the structure of the alpha and beta particle and give their overall charge and a material which it cannot pass through.

Alpha - it is composed of 2 protons and 2 neutrons. It has an identical structure to a helium nucleus (an atom with no orbiting electrons). It has an over charge of +2. It cannot pass though a sheet of paper...
LM
Answered by Liam M. • Physics tutor
6518 Views

What are the differences between microwaves and radio waves? How does this effect what we use them for?

Microwaves and radio waves are both used for communication purposes. Microwaves have a higher frequency, and therefore a smaller wavelength. Because of this, microwaves can travel through the Earth's atmosph...
MR
Answered by Madeleine R. • Physics tutor
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A tennis ball is hit over a net with a speed of 45ms^-1 and has a mass of 30g. Calculate the kinetic energy of tennis ball.

K=0.5 mv^2 K=0.5 0.03*(45^2) K=30.4J
LM
Answered by Liam M. • Physics tutor
3975 Views

Define electric current

Electric current is a measure of the rate of flow of charges. What this means is how many charges are flowing in a circuit in a certain time period. Mathematically this is expressed as I=Q/t where I is for c...
LM
Answered by Liam M. • Physics tutor
5722 Views

Two balls of identical size and shape are dropped from the same height. One ball has a mass of 50kg and the other has a mass of only 10kg. Why do they reach the ground at the same time?

The only forces acting on the balls are gravity (pulling down) and air resistance (pushing up). Since the balls are the same shape and size, the air resistance will be the same on both. Likewise, the gravita...
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Answered by Gregor P. • Physics tutor
17559 Views