When there is not enough___, change in a substance cannot occur.

Aray of light traveling parallel to the principal axis of a concave mirror will be reflected through the mirror's

Which are advantages of renewable resources? check all that apply. renewable energy supplies are completely reliable everywhere. some renewable resources will never be used up. little or no waste is produced by renewable resource plants. electricity can be generated in large quantities. many renewable energy facilities have lower operating costs.

Wavelength of 125 meters is moving at a speed of 10 m/s. what is it's frequency?