Physics help!?

Question

Any help is MUCH appreciated!

1. A compass pointing north will point in a different direction when placed near a piece of metal. Which causes this to happen?

a magnetic fields

b electromagnetism

c electricity

2. Which sets of data show a wave with the shortest wavelength?

a) speed = 100 million m/s and frequency = 50 million Hz

b) speed = 150 million m/s and frequency = 1500 Hz

c) speed = 300 million m/s and frequency = 100 Hz

3.Which describes the attraction or repulsion caused by magnets?

a magnetic domain

b magnetic force

c magnetic field

Answer 1

1)  A) the magnetic field operates over a short distance.  A compass usually reacts with the Earth's magnetic field, but if another piece of metal gets in the range of the compass needle magnet's magnetic field the needle will deflect toward the metal

2) A) velocity = frequency times wavelength

The smallest value for wavelength is going to be 100 million m/s divided by 50 million Hz

3) Magnetic force.  You need force to have an attraction of repulsion.

Answer 2

1. A

2. A

3. B