Which type of wave cannot travel through a vacuum? visible light waves x-ray waves gamma ray waves sound waves

We have a colorless transparent liquid. it looks like water. we seperated it into a solid and a liquid by evaporration and condention was this a chemichal or a physical seperation a. chemical seperation b. physical seperation

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

If you wanted to move an electron from the positive to the negative terminal of the battery, how much work w would you need to do on the electron? enter your answer numerically in joules.