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23 Nov 2019
QuestionDetails:a)The scale of a spring balance reading from 0to 175N has a lengthof 14.5 cm. A fish hangingfrom the bottom of the spring oscillatesvertically 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 afrequency of 22.0 kHz.This bat hears its own sound plus the soundreflected by thewall. How fast should the bat fly, vb,tohear a beat frequency of 215 Hz?
Take the speed of sound to be 344 m/s.
Express your answer numerically in meters per second tothreesignificant figures.
c)What is the thinnest soap film (excluding the case ofzerothickness) that appears black when illuminated with light withawavelength 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.
| QuestionDetails: a)The scale of a spring balance reading from 0to 175N has a lengthof 14.5 cm. A fish hangingfrom the bottom of the spring oscillatesvertically 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 afrequency of 22.0 kHz.This bat hears its own sound plus the soundreflected by thewall. How fast should the bat fly, vb,tohear a beat frequency of 215 Hz? Take the speed of sound to be 344 m/s.
c)What is the thinnest soap film (excluding the case ofzerothickness) that appears black when illuminated with light withawavelength 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. |
Collen VonLv2
7 May 2019
