Mathematics test in a high school
On a mathematics test in a high school, scores are normally distributed with a mean of 77 and a standard deviation of 16.8. A student is randomly selected.
Find the probability that his/her test score is smaller than 80.
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What is the frequency in Hz of the photon released when a hydrogen atom undergoes a transition from the excited state where n = 6 to the state where n = 3?
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