21. What is the most likely outcome of decreasing the frequency of incident light on a diffraction grating? A. lines become narrower
B. distance between lines increases
C. lines become thicker
D. distance between lines decreases

Energy is the ability to do work which measures what

Calculate the mass of an object that has a momentum of 100kg x m/sec and velocity of 4 m/sec

The force acting on a beam was measured under the same operating conditions and a sample of 5 data points was collected. this process was repeated by 3 observers. the pooled standard deviations of these 3 data sets was 1.21. determine the true mean force using all pooled data (with a 95% probability). the result should look like this: true mean = mean +/- margin of error