Longitudinal waves are made up of areas of more dense particles or less dense particles. The less dense particles are called ___. a. crest
b. compressions
c. wavelengths
d. rarefactions

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.

What do you think car designers do if the damage caused by a crash test is too severe?

Which atomic model was proposed as a result of j. j. thomson’s work?