A longitudinal wave is observed to be moving along a slinky. Adjacent crests (compressions) are 0.8 meters apart. Exactly 1.4 crests are observed to move past a given point in 0.9 seconds. What is its frequency? (Hint: there is extra information in this problem that you don't need).

answer: the correct answer id option(d).

explanation:

snell's law refraction:

the angle of refraction =

the angle of incidence =

refractive index of air = = 1

refractive index of glycerol = 1.47

from the given options, the most closest answer to 63.72° is 65° of option (d).

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305.7

explanation:

density =m/v

density =917/3.00

density = 305.

approximately = 305.7

in four significant figures