4. The loudness of the sound depends on the energy. More energy gives a louder sound. We call the loudness , which is measured in .

the loudness of sound is called the sound wave or the volume..and it is measured in devibels(dB)

this allows people to make the best decision or pursue the best option. when alternatives are weighed using their advantages and disadvantages, the option whose disadvantages outweigh the advantages (based on a qualitative or quantitative analysis) are shunned while those whose advantages outweigh their disadvantages are pursued.  

c.the charges if the proton and electron and gravity