Electromagnetic waves with a short wavelength occur at a frequency and are energetic.
A.
high; less
B.
high; more
C.
low; more
D.
low; less

The first law of thermodynamics states that heat added to a system is neither created nor destroyed but is as it changes into other forms of energy.

What happens when the vapor pressure of a liquid is equal to the external pressure?

Hydroelectricity provides about 7 percent of the electricity generated in the united states. (a) explain how a hydroelectric power plant converts energy stored in water into electricity. (b) identify two factors that determine the amount of electricity that can be generated by an individual hydroelectricity power plant. (c) describe the two main types of land-based hydroelectric power plants. (d) describe two economic advantages and two environmental disadvantages of hydroelectricity.