It’s a presentation by S.M.Nasrullah Senior Lecturer in English, Cambrian College

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Unit-8, Lesson-3 English For Today Class-xi

By the end of the lesson the students will be able- By the end of the lesson the students will be able- 1. to differentiate between “Sound” and “Noise” and learn the unit of measuring sound. 1. to differentiate between “Sound” and “Noise” and learn the unit of measuring sound. 2. to find out the causes and effects of sound pollution and ways of reducing sound pollution. 2. to find out the causes and effects of sound 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 outcome

When the vibration of air is at a tolerable and pleasant level to human hearing is known as “sound.” But When the vibration of air is at a tolerable and pleasant level to human hearing is known as “sound.” But When the sound is unpleasant and loud, it is called “noise”. It is harsh and irritating. When the sound is unpleasant and loud, it is called “noise”. It is harsh and irritating. Difference between “Sound’ and “Noise”

Unit of measuring loudness of sound is “Decibel”. Unit of measuring loudness of sound is “Decibel”. Remember carefully:(about sound) Remember carefully:(about sound) Human’s Tolerance limit - 45 decibel Human’s Tolerance limit - 45 decibel Harmful for human – (70+) decibel Harmful for human – (70+) decibel Cities’ sound range – (30-90) decibel Cities’ sound range – (30-90) decibel What is “Decibel” ?

Causes of sound pollution

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

Bad effects of noise pollution

 Lack of concentration  Increases human anger  Affects our hearing  Increases our heartbeat

Things to be done to reduce “noise pollution” 1. Raising public awareness 2. Careful town planning Master plan of a city

Word meaning; Measure (act of measuring) Insulation (0ne kind of layer used inside the room to protect Sound)

Word meanings: Word meanings: Expose – Show, Exhibit Provide- Supply, give Pleasant – pleasing to the mind Exceed- cross, be more or greater than

Learning Grammar: (From Text) Use of 1 st Conditional: If+ Present+ Future Learning Grammar: (From Text) Use of 1 st 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 gradually become deaf. 2. If we live in a noisy environment, we will gradually become deaf. Zero Conditional(exception) : 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 exceeding 70 decibel, serious harm can be caused. 2. If they are regularly exposed to sounds exceeding 70 decibel, serious harm can be caused. `a

Group work: Find out which cause ‘sound” and which cause “noise”. Motor cycle – 100 decibel Diesel truck- 80 decibel Refrigerator- 45 decibel Live Rock Music decibel Vehicles in Dhaka city decibel Alarm Clock- 80 decibel Screaming child – decibel

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

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

Best of luck