When can a girl become pregnant? O when she first ovulates
O when she first menstruates
O when she has been menstruating for about a year
O after her second period

The two most prominent wavelengths in the light emitted by a hydrogen discharge lamp are 656 nm(red) and 486 nm (blue). light from a hydrogen lamp illuminates a diffraction grating with 520lines/mm , and the light is observed on a screen 1.5m behind the grating. part a what is the distance between the first-order red and blue fringes? express your answer to two significant figures and include the appropriate units.

What is the most useful equation for electric power?

The cerebellum controls? thirst sensations sleep-wake cycles hand-eye coordination heart rate and pulse