A television station emits waves with a frequency of 2.5 × 108 Hz. Electromagnetic waves travel at a speed of 3.0 × 10^8 m/s Calculate the wavelength of the waves emitted by this television station.

The least penetrating form of radiation is

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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?