A) find the wavelength of an electromagnetic wave with frequency 9.35 ghz = 9.35 109 hz (g = giga = 109), which is in the microwave range. λ = m
(b) find the speed of a sound wave in an unknown fluid medium if a frequency of 532 hz has a wavelength of 2.00 m.

20) what is a magnetic field? 21) in which direction do magnetic field lines always point? 22) sketch a diagram showing how a plotting compass points around a 23) name two magnetic poles that will: a) attract each other b) repel each other. 24) explain why you can use a compass to navigate. 25) what's an electromagnet? 26) list two ways to increase the strength of an electromagnet. 27) the wire in a simple motor feels a force when a current flows through it. why is this? i need answers to check mine