What is resistance of a power grid that has voltage of 25,000 volts 1400 amps

What happens to light waves from a star as the star moves away from earth?

At very high pressures, gases become and will eventually a) more dense; become hotter b) more dense; change to a liquid or solid c) less dense; combust d) less dense; turn into a liquid

The frequency of the fundamental of the guitar string is 320 hz. at what speed v do waves move along that string?