The number of waves that pass a point in one second is called

A frequency is the number of waves that pass a point in one second.

In physics, frequency refers to number of waves which passes a fixed point in unit time.

Hence, because waves are always on move, the term "frequency" represent the number of waves that pass a given point in a specified time.

In conclusion, a frequency is the number of waves that pass a point in one second.

Read more about frequency

link

nacl or sodium chloride is an ionic compound. this is because an ionic compound pertains to a compound that consists of positively and negatively charged ions. in this case, na (sodium) has a tendency to lose one electron when it reacts with with other atoms, so the resulting sodium ion contains 11 protons and 10 electrons, thus making it positively charged (na+), when chlorine reacts, it usually gains one electron to form an ion called chloride, thus making it negatively charged ( since the ions are oppositely charged, they attract.

o conteúdo de calor de um sistema é igual à entalpia apenas para um sistema que é constante