It’s a presentation by

S.M.Nasrullah Senior Lecturer in English, Cambrian College

Watch the video clip and try to guess the theme of it

Unit-8, Lesson-3

English For TodayClass-xi

By the end of the lesson the students will be By the end of the lesson the students will be able-able-

1. to differentiate between “Sound” and “Noise” 1. to differentiate between “Sound” and “Noise” and learn the unit of measuring sound.and learn the unit of measuring sound.

2. to find out the causes and effects of sound 2. to find out the causes and effects of sound pollution and ways of reducing sound pollution. pollution and ways of reducing sound pollution.

3. to write sentences with first conditional using ‘if’. 3. to write sentences with first conditional using ‘if’.

Learning outcomeLearning outcome

When the vibration of air is at a When the vibration of air is at a tolerabletolerable andand pleasantpleasant level to human hearing is known as level to human hearing is known as “sound.” “sound.” ButBut

When the sound is When the sound is unpleasant and loudunpleasant and loud, it is , it is called “noise”. It is called “noise”. It is harsh and irritatingharsh and irritating..

Difference between “Sound’ and “Noise”Difference between “Sound’ and “Noise”

UnitUnit ofof measuring loudness of measuring loudness of sound sound is “Decibel”.is “Decibel”.

Remember carefully:(about sound)Remember carefully:(about sound)

Human’s Tolerance limit - 45 decibelHuman’s Tolerance limit - 45 decibel

Harmful for human – (70+) decibelHarmful for human – (70+) decibel

Cities’ sound range – (30-90) decibelCities’ sound range – (30-90) decibel

What is “Decibel” ?What is “Decibel” ?

Causes of sound pollutionCauses of sound pollution

Causes of sound pollutionCauses of sound pollution

Factory workFactory work Primary school teaching Primary school teaching Truck driving Truck driving Airport Airport growth of urban population growth of urban population increasing use of machines in increasing use of machines in

citiescities

Bad effects of noise pollutionBad effects of noise pollution

Bad effects of noise pollutionBad effects of noise pollution

Lack of concentrationLack of concentrationIncreases human angerIncreases human angerAffects our hearingAffects our hearingIncreases our heartbeatIncreases our heartbeat

Things to be done to reduce Things to be done to reduce “noise pollution” “noise pollution”

1. Raising public awareness 2. Careful town planning

Master plan of a city

Word meaning;Word meaning;

MeasureMeasure

(act of measuring)(act of measuring)

InsulationInsulation(0ne kind of layer (0ne kind of layer

used inside the used inside the

room to protect room to protect

Sound)Sound)

Word meanings:Word meanings:

Expose – Show, ExhibitProvide- Supply, givePleasant – pleasing to the mindExceed- cross, be more or greater than

Learning Grammar:Learning Grammar: (From Text)(From Text)Use of 1Use of 1stst Conditional: If+ Present+ Future Conditional: If+ Present+ Future

Example- 1. If you come, I shall/will go. Example- 1. If you come, I shall/will go.

2. If we live in a noisy environment, we will 2. If we live in a noisy environment, we will gradually become deaf.gradually become deaf.

Zero Conditional(exception)Zero Conditional(exception) : If + Present + Present: If + Present + Present

Example: 1. If we heat ice, it turns into water. Example: 1. If we heat ice, it turns into water.

2. If they are regularly exposed to sounds 2. If they are regularly exposed to sounds exceeding 70 decibel, serious harm can be caused.exceeding 70 decibel, serious harm can be caused.

`a`a

Group workGroup work: Find out which cause : Find out which cause ‘sound” and which cause “noise”.‘sound” and which cause “noise”.

Motor cycle – 100 decibelMotor cycle – 100 decibel

Diesel truck- 80 decibelDiesel truck- 80 decibel

Refrigerator- 45 decibelRefrigerator- 45 decibel

Live Rock Music -90-130 decibelLive Rock Music -90-130 decibel

Vehicles in Dhaka city-75-85 Vehicles in Dhaka city-75-85 decibeldecibel

Alarm Clock- 80 decibelAlarm Clock- 80 decibel

Screaming child – 90-115 decibelScreaming child – 90-115 decibel

Evaluation:Evaluation:

Answer the Questions:Answer the Questions:1. What do you mean by “sound” 1. What do you mean by “sound” and “noise”?and “noise”?2. What occupations are 2. What occupations are responsible for noise pollution?responsible for noise pollution?3. What can be done to decrease 3. What can be done to decrease noise pollution?noise pollution?

Home work:Home work:

Write down the names of other Write down the names of other things which make sound things which make sound pollution in the cities.pollution in the cities.

Best of luckBest of luck