I have no idea what I'm doing and I really am desperate for help. What is the wavelength change of a radio signal, if the emitting source is moving away at 3,000 km/s? The lab (rest) wavelength of this radio signal is 1 meter​.​

What are atoms of the same element with varying number of neutrons

Acaterpillar tries to climb straight up a wall a meter high, but for every 2 cm up it climbs, it slides down 1 cm. eventually, it reaches the top. when it reaches the top, it does not pull itself over so it will slide down 1 cm. what is the total displacement traveled?

What sort of waves exhibit the doppler effect?