In a post-apocalyptic world, you must use these metal combs as gratings for gigahertz spectroscopy. The spacing of the comb teeth is 2 mm. If you direct GHz electromagnetic waves at the comb, what frequency (in GHz) is deflected by 10 degrees?

Assume similar data for the motion of the blood in your aorta. estimate how many beats of the heart it will take the blood to get from your heart to your brain. (assume that the distance from your heart to your brain is 30 cm)

This is a form of winter precipitation. it is frozen precipitation falling as ice pellets. snowflakes melt into raindrops as they pass through a thin layer of warmer air. the raindrops then refreeze into particles of ice when they fall into a layer of sub-freezing air near the surface of the earth. this precipitation is called a) hail. b) rain. c) sleet. d) snow.

Acid rain is caused by human activity. select the best answer from the choices provided t f