## Question

###### Identify the type of observational study (cross-sectional, retrospective, prospective).A researcher from Johns Hopkins University obtains data about the effects of alcohol on driving by examining car crash reports from the past five years.

Identify the type of observational study (cross-sectional, retrospective, prospective). A researcher from Johns Hopkins University obtains data about the effects of alcohol on driving by examining car crash reports from the past five years.

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Which of the following statements are true for the photo-electric effect? (select true or false) The maximum energy of the ejected electrons is proportional to the velocity of the photons: The maximum energy of the ejected electrons varies linearly with the frequency of the incoming photons: The max...

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