Calculate the speed of a wave that has a frequency of 20,100 Hz and a wavelength of 0.67 m.

Energy is the ability to do work which measures what

The speed of light can be used to measure the

Currents in dc transmission lines can be 100 a or higher. some people are concerned that the electromagnetic fields from such lines near their homes could pose health dangers. for a line that has current 150 a and a height of 8.0 m above the ground, what magnetic field does the line produce at ground level? express your answer in teslas and as a percentage of the earth’s magnetic field, which is 0.50 g. is this value cause for worry?