Reflaction and refraction

LESSON FIVE

Tell you groupmates what do you think about the quotation.

Unjumble the words to make sentences

Complete the sentences given below with the missing words.

Light Bulb

Most people believe that the light bulb was invented by Thomas Edison. In fact, it was invented in 1809 by Humphry Davy, an English chemist. Unfortunately, it was not very useful, and wasn’t like our modern version of a light bulb.

What Edison did do was invent a carbon filament that burned for up to 40 hours – a good bit longer than the one invented a year earlier that burned for around 13.5 (and the one before that was even less!). It is said that Edison tried and failed over 2000 times before finally perfecting the filament.

1) Three top inventions that changed the world are …, … and ….

2) Penicillin is credited to scientist Alexander Fleming in ….

3) Ernest Duchesne was a person who ….

4) The father of electricity is ….

5) Thomas Edison, Allessandro Volta, Andre-Marie Ampere and others contributed to our modern … ….

6) Most people believe that the light bulb was invented by …. In fact, it was invented in … by Humphry Davy, an English chemist.

7) Edison invented … that burned for up to 40 hours.

8) It is said that Edison tried and failed over … before finally perfecting the filament.

9. Discuss the questions:

1. How often do you watch TV, use your mobile phone?

2. Can you imagine your life without them?

3. What do you think was the most important invention of the last fifty years? Why?

4. What you think were the top 5 inventions of the last century. Give reasons for your opinion.

know people physics don’t how understand I. I think it’s a fascinating I more and wish understood subject really. our seems explain about Physics to everything world and our universe. to It’s as though physics is the key unlocking all of our world’s mysteries. I really enjoyed studying physics at the beginning. It was interesting then. difficult But and then I it couldn’t got understand the formulae. I have a lot of respect for physicists. They really to seem understand to lots be of able difficult things. Without them, we would still be living very basic lives. Physicists have sent people to the Moon. Their technology to modern led our has of research all. I always and fewer read to choosing are students fewer study physics. This is a shame.

‘To invent, you need a good imagination and a pile of junk.’ (Thomas A. Edison)

1. Look at the definitions given below? Try to guess the words they define.

o a process in which light, other electromagnetic radiation, sound, particles, etc., are thrown back after impinging on a surface.

o the change in direction of a propagating wave, such as light or sound, in passing from one medium to another in which it has a different velocity.

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