Which option identifies the type of study described in the following scenario? A group of 500 people are selected at age 20 and followed for 15 years. The people who go on to develop a certain
type of cancer are compared with those who do not. The researchers are attempting to determine different factors that
could increase cancer risk.
historical cohort study
double-blind drug trial
O prospective cohort study
randomized controlled trial

The experiment done in lab is repeated, using a ball that has unknown mass m. you plot your data in the form of f 2 versus m/l, with f in rev/s, m in kg, and l in m. your data falls close to a straight line that has slope 3.19 m/(kg · s2). use g = 9.80 m/s2 and calculate the mass m of the ball.

Ultraviolet radiation is dangerous because it has a high enough energy to damage skin cells. what is the best explanation of the relationship between wavelength and wave energy? a) wave energy is related only to frequency, not wavelength. b) longer wavelengths have lower frequencies but higher energy. c) the shorter the wavelength, the lower the frequency and the higher the energy. d) the shorter the wavelength, the higher the frequency and the higher the energy.

Which wave is the result of amplification and produces a louder sound