If you were asked to describe metals and magnetism you could say?

Trumpeter a holds a b-flat note on the trumpet for a long time. person c is running towards the trumpeter at a constant velocity. person b is running away from the trumpeter at the same rate. person d is standing still the whole time. which person hears a frequency that is lower than the b-flat?

Which one of the following research methods can show cause and effect

State the following: boyle's law and charle's law