Most fuel gases used for welding are

Two friends at different locations want to communicate with each other by sending low energy signals. which of the following methods can they use to communicate? a) produce x-rays using colliding electrons and send them to radios, which capture sound b) send messages using infrared radiation, which travel in the form of waves c) send radio waves through intervening media like radio and television d) produce sound waves using microwaves from heated objects

The speed of light is around 6.706×10^8 miles per hour. what is the speed of light in units of miles per minute?

0.2348 grams of pbcl2 used to form 44.0 ml of solution.