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

answer: the potential energy decreases from 379 j to 243 j

explanation:

for the law of conservation of energy, the total energy in a system must be conserved. the total energy of the system is given by the sum of kinetic (k) and potential (u) energy:

e = k + u

the total energy is e=675 j, and this does not change.

initially, the kinetic energy is k=296 j, so the potential energy is

at the end, the kinetic energy is k=432 j, so the potential energy is

so, we see that the potential energy has decreased from 379 j to 243 j.