1. Jenny knows that the atomic number of the element potassium, K, is 19. She also knows that the average atomic mass can be used to find out how many neutrons
are in most atoms of an element. If the average atomic mass of potassium is
39.098, how many neutrons are found in most atoms of potassium?
A.19
B.20
C.39
D.40

A6.10 m nacl can be made by adding [x]g of nacl to a container and making the volume of water up to the 1.00 l line

Which statement best describes the relationship between period and frequency of light waves? a) in wave b the period increases and the frequency decreases from wave a. b) in wave a the period increases and the frequency decreases from wave b. c) in wave b the period is shorter and the frequency is greater than in wave a. d) in wave a the period is shorter and the frequency is greater than in wave b.

When a spring is compressed, the energy changes from kinetic to potential. which best describes what is causing this change?