The period T is time it takes for one complete cycle or from "trough to trough" so the reverse is trough per sec = 1/T = frequency
Answer:
please write neater
Explanation:
can you write neater so I can answer th question but also is a equal to b
The time for the echo to return is directly proportional to the distance. vw = fλ. In a given medium under fixed conditions, vw is constant, so that there is a relationship between f and λ; the higher the frequency, the smaller the wavelength.
The answer is B. This form of magnesium chloride is not a liquid but a solid that is white and colorless.
