What causes a regular reflection?

a. light waves strike a rough, uneven surface at a 45 degree angle and are reflected back at a 90 degree angle.

b. parallel light waves strike a smooth, polished surface and reflect back in the same direction.

c. parallel light waves strike a rough, uneven surface and reflect in different directions.

d. light waves strike a smooth, polished surface at a 90 degree angle and are reflected back at a 45 degree angle.

Protons and neutrons are found within the nucleus of an atom

Akg a of 55 m at an of 11 ? . if is at 98 km/h, be ?

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.