The laws of refraction and reflection are the same for sound as for light. the speed of sound in air is 340 m/s and in water it is 1510 m/s. if a sound wave approaches a plane water surface at an angle of incidence of 12.0 °, what is the angle of refraction?

θ = 67.4242°

Explanation:

The law of refraction, or Snell's law, states that:

With n1 = v1/c      n2 = v2/c

Therefore:

If 1 denotes the air-side:

v1 = 340 m/s

v2 = 1510 m/s

θ1 = 12°

θ2= 67.4242°

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answer: 2×10^-2kg

explanation: density= mass per volume

vol=mass/density

converting to s.i units we have;

3÷1000kg = 0.003

1.5÷100m = 0.15

0.003/0.15 = 0.02kg