Which statement best describes longitudinal waves?
a. particles of the wave medium move perpendicular to the direction of propagation of the wave.
b. longitudinal waves do not require a material medium for propagation.
c. particles of the wave medium move parallel to the direction of propagation of the wave.
d. particles of the wave medium move long distances from the source of the wave to carry energy.

Explain the difference between each pair of concepts. a. frequency and relative frequency b. percentage and relative frequency a. select the correct choice below. a. frequency is the total number of observations in a data set. relative frequency is the number of times a particular distinct value occurs. b. frequency is the number of times a particular distinct value occurs. relative frequency is the ratio of the frequency of a value to the total number of observations. c. frequency is the total number of observations in a data set. relative frequency is the ratio of the number of times a particular distinct value occurs to the frequency. d. frequency is the number of times a particular distinct value occurs. relative frequency is the ratio of the frequency of two different values.

Chemical energy is a form of energy. a. heat b. kinetic c. potential d. electromagnetic

What pressure difference is required between the ends of a 2.0-m-long, 1.0-mm-diameter horizontal tube for 40 c water to flow through it at an average speed of 4.0 m/s?