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23 Nov 2019
x.Hmale of a spring balance reading from 0 to 175N has a length of14.5 cm. A fish hanging from the bottom of the spring oscillatesvertically at a frequency of 3.00 Hz.
Ignoring the mass of the spring, calculate the mass of the fish.Leave your answer in Kg.
b)A bat flies toward a wall, emitting a steady sound with afrequency of 22.0 kHz. This bat hears its own sound plus the soundreflected by the wall.
How fast should the bat fly, vb,to hear a beat frequency of 215 Hz?
Take the speed of sound to be 344 m/s.
Express your answer numerically in meters per second to threesignificant figures.
c)What is the thinnest soap film (excluding the case of zerothickness) that appears black when illuminated with light with awavelength of 495 nm? The index of refraction of the film is 1.35,and there is air on both sides of the film.
x.Hmale of a spring balance reading from 0 to 175N has a length of14.5 cm. A fish hanging from the bottom of the spring oscillatesvertically at a frequency of 3.00 Hz.
Ignoring the mass of the spring, calculate the mass of the fish.Leave your answer in Kg.
b)A bat flies toward a wall, emitting a steady sound with afrequency of 22.0 kHz. This bat hears its own sound plus the soundreflected by the wall.
How fast should the bat fly, vb,to hear a beat frequency of 215 Hz?
Take the speed of sound to be 344 m/s.
Express your answer numerically in meters per second to threesignificant figures.
c)What is the thinnest soap film (excluding the case of zerothickness) that appears black when illuminated with light with awavelength of 495 nm? The index of refraction of the film is 1.35,and there is air on both sides of the film.
