How much time would it take for the sound of thunder to travel at an average speed of 330 meters per second a distance of 8000

What would the difference of spectral lines emitted by hydrogen gas in distant galaxies which is normally found at a wavelength of 21 cm on earth, be observed at 21.1 centimeters?

Do you agree with scientist’s prediction about the warming of alaska and other polar regions?

How are series and parallel circuits simililar? both have multiple paths for electrons to travel. both require resistors in their circuits. both require a switch to complete the circuit. both have at least one path for electrons to travel.