A. Adding the number of protons and number of neutrons in the atom
Electrons are so incredibly small that the number of electrons makes almost no difference in the atomic mass. So b and c are not the answer.
D doesn't really make sense because like if you want to know the mass of a basket of apples and oranges, you'd add up the apples' and oranges' masses, not subtract.
Energy is the ability to do work.
Explanation:
Energy can be converted from one form to another. Examples: Gasoline (chemical) is put into our cars, and with the help of electrical energy from a battery, provides mechanical (kinetic) energy. ... Similarly, purchased electricity goes into an electric bulb and is converted to visible light and heat energy.
Hertz Pitch and frequency
