The correct mass of a block is 28.0 grams. A chemist measures the block 4 times and records the following measurements: 42.0 grams; 41.8 grams;
42.1 grams; and 41.9 grams. Identify the accuracy and precision of the
chemist's measurements.
O NOT accurate, but precise
O Neither- NOT accurate and NOT precise
O Both accurate AND precise
O Accurate, but NOT precise

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.