In a certain experiment, a radio transmitter emits sinusoidal electromagnetic waves of frequency 125.0 in opposite directions inside a narrow cavity with reflectors at both ends, causing a standing wave pattern to occur.partA:How far apart are the nodal planes of the magnetic field?Express your answer using four significant figures.partB:If the standing wave pattern is determined to be in its eighth harmonic, how long is the cavity?Express your answer using four significant figures