What does the frequency of a wave represent?
1. the distance between 2 consecutive crests
2. the number of wave cycles that pass through a specific point within a given time period
3. the distance between the highest and lowest points of a wave
4. the length of a wave that pass through a specific point within a given time period,

Harry lives in a city, and he has a lung condition known as asthma. on certain days, harry has to stay inside because pollutants in the air make it difficult for him to breathe. which of these pollution sources are nonpoint sources that might bother harry if he goes outside? choose the two that apply.

Covalent bonds generally form when the bonded elements have a difference in electronegativity less than 1.5. subtract the electronegativities for the following pairs of elements and predict whether they form a covalent bond. electronegativity difference of c and c: ionic covalent electronegativity difference of mg and cl: ionic covalent

Which of the following is described by the equation h2o(s)+ heat=h2o(i) a freezing melting condensing evaporating