8. Give me an example of a number that we use that is actually exact and not subject to sig, digit rules. Again, give me the name of the number (My example "I have 25 students in class). US

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.

Calculate the number of kilojoules to warm 125 g of iron from 23.5°c to 78.0°c.

In salt water solution,the salt is the blank