Which radioactive isotopes did the Curies discover? polonium and radium
radium and carbon-14
carbon-14 and uranium
uranium and polonium

A100-watt light bulb radiates energy at a rate of 100 j/s. (the watt, a unit of power or energy over time, is defined as 1 j/s.) if all of the light emitted has a wavelength of 525 nm , how many photons are emitted per second?

Turbo the snail moves across the ground at a pace of 12 feet per day. if the garden is 48 feet away, how many days will it take for the snail to get there?

Do polar molecules have ionic bonds?