How fast should the bat fly, v b ,to hear a beat frequency of 215 Hz? Take the s

Question

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 filmis 1.35, and there is air on both sides of the film.

QuestionDetails: a)The scale of a spring balance reading from 0to 175N has a length of 14.5 cm. A fish hangingfrom the bottom of the spring oscillates vertically at a frequencyof 3.00 Hz.

Ignoring the mass of thespring, calculate the mass of the fish. Leave your answer inKg. b)A bat flies toward a wall,emitting a steady sound with a frequency of 22.0 kHz.This bat hears its own sound plus the sound reflected by thewall.

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 filmis 1.35, and there is air on both sides of the film.

Express your answer in nanometers.

Explanation / Answer

a)
spring constant=k k=force/distance k=175N/.145m=1206.897N/m we also know that
frequency = f = (k/m)/2pi so m=k/(2pi*f)^2 m=1206.897N/m/((2*3.0)^2)=3.40kg

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