Which one of the following accurately describes a proper use of eyeglasses?

a. using converging lenses to a nearsighted person by moving the image from in front of the retina to the retina
b. using diverging lenses to a nearsighted person by moving the image from in front of the retina to the retina
c. using converging lenses to a nearsighted person by moving the image from behind the retina to the retina
d. using diverging lenses to a farsighted person by moving the image from behind the retina to the retina

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.

Critical mass is the of material required to produce a chain reaction. a.) minimum amount b.) atomic mass c.) precise amount d.) maximum amount

Amoving electron has kinetic energy k1. after a net amount of work w has been done on it, the electron is moving one-quarter as fast in the opposite direction. (a) find w in terms of k1. (b) does your answer depend on the final direction of the electron's motion?