Question 4 (5 points)
which of the following statements is true?
question 4 options:

most of the nuclear radiation you are exposed to in the environment is man-made.

you are exposed to nuclear radiation every day.

all natural radiation is at a level low enough to be safe.

naturally occurring nuclear radiation is called background decay.

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.

The chart shows the bid provided by four contractors to complete a job. which contractor is the most cost-effective?

Each of the following reactions is allowed to come to equilibrium and then the volume is changed as indicated. predict the effect (shift right, shift left, or no effect) of the indicated volume change. drag the appropriate items to their respective bins.co(g) + h2o(g) < => co2(g) + h2(g) (volume is decreased) pcl3(g) + cl2(g) < => pcl5(g) (volume is increased) caco3(s)< => cao(s) + co2(g) (volume is increased)