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11th Standard English Medium Physics Subject 11th Standard English Medium Physics Subject Waves Creative 2 Mark Questions with Solution Part - II

Published on: 23/06/2021

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Std: 11th Standard - Physics

chapter: - Creative Questions

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Questions:

Generic 2

5 x 2 = 10

A train moves towards a stationary observer with speed 34 m/s. The train' sounds a whistle and its frequency registered by the observer is f_1. the train's speed is reduced to 17 m/s, the frequency registered is f₂. If the speed of sound is 340 m/s, then find the ratio f_1/f_2.

Tube A. has both ends open, while B has on end closed otherwise the two tubes are identical. What is the ratio of fundamental frequency of the tubes A and B?

An observer moves towards a stationary source of sound with a velocity one-fifth of the velocity of sound. What is the percentage increase in the apparent frequency?

Define reverberation time?

What is musical scale?

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Answers Key:

Generic 2

5 x 2 = 10

For the stationary observer \({ f }_{ 1 }=\cfrac { v }{ v-{ v }_{ g } } \times f\)
\(\therefore { f }_{ 1 }=\cfrac { 340 }{ 340-34 } \times f_{ 2 }=\cfrac { 340 }{ 340-17 } \times f\)
Hence,\(\cfrac { { f }_{ 2 } }{ { f }_{ 1 } } =\cfrac { 340-17 }{ 340-34 } =\cfrac { 19 }{ 18 } \Rightarrow f_{ 1 }:{ f }_{ 2 }=19:18\)

The fundamental frequency for tube A with both ends open is \({ f }_{ A }=\cfrac { v }{ 2L } \)
The fundamental frequency for tube B with one end closed is \({ f }_{ B }=\cfrac { v }{ 4L } \)
\(\cfrac { { f }_{ A } }{ { f }_{ B } } =\cfrac { v/2L }{ v/4l } =2\Rightarrow { f }_{ A }:{ f }_{ B }=2:1\)

Here observer moves towards the stationary source
V_o = - v/5, v_s = 0
Apparent frequency \(f'\cfrac { v-{ v }_{ 0 } }{ v-{ v }_{ s } } \times f=\cfrac { v-v/5 }{ v-0 } \times f=\cfrac { 6 }{ 5 } v=1.2v\)
\(\cfrac { f'-f }{ f } \times 100=\cfrac { 1.2f-f }{ f } \times 100=20\%\)

It is defined as the time which sound takes to fall in intensity to one millionth (10-6) part of its original intensity after it was stopped,

A series of notes whose fundamental frequencies have definite ratios and which produce a pleasing effect on the ear when sounded in succession constitute a musical scale.