Please help due in 5MINS!! Give two reasons why a long wave can pick up a signal despite the presence of hills and the curved surface of the Earth between it and the transmitting aerial.

Which pair of quantities includes one quantity that increases as the other decreases during simple harmonic motion?

Positive ions differ from neutral atoms in that

Certain bacteria (such as aquaspirillum magnetotacticum) tend to swim toward the earth’s geographic north pole because they contain tiny particles, called magnetosomes, that are sensitive to a magnetic field. if a transmission line carrying 100 a is laid underwater, at what range of distances would the magnetic field from this line be great enough to interfere with the migration of these bacteria? (assume that a field less than 5% of the earth’s field would have little effect on the bacteria. take the earth’s field to be 5.0 * 10-5 t, and ignore the effects of the seawater.)