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Light Waves

• Light is a transverse wave which is produced from (sun, candles, fire).
• Light travels in a straight line.
• Light waves also transfer energy from one place to another and can also be reflected.
• Whilst water wave travel and transfer energy by moving particles, light waves DO NOT need particles to travel. This is an advantage as the light from the sun must travel through space (no particles) to reach earth. In fact, they are slowed down by particles
• Light travels the fastest in a vacuum as there are no particles to get in the way.
• Speed of light in a vacuum = 3 x 10^8 m/s

How long have you…? (present perfect 4) Exercises

Use the information given to create questions beginning with ‘How long…?’

• It is snowing.

• The weather is shining.

• John and Kate are married.

• My brother has gone on holiday.

• My aunty and uncle live in Canada.

• My sister is a teacher.

• I work at the chemist.

• I’ve known Susan since I was a baby.

• Jonathan is learning to speak to Mandarin.

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Fill in the missing gaps in the sentences using the present perfect (=has/have + past participle)

• I have known Kate a long time.

• My brother has been playing the piano he was 11 years old.

• My mum and dad on holiday to America. They

gone since last Sunday.

• I Ben and Emma since primary school.

We to the same primary and secondary school.

• My sister learning to speak French because she
is going to France next month.

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Use the appropriate words in the missing gaps.

have you lived       lives      to

has been       works        have known

I have bought       have worked.

• My sister in Spain. She is studying Spanish

with her friend Rosie. I Rosie since I was 5.

• Spencer like with Jamie. They have worked

together for 2 years.

• How long in Australia?

• a new dress for prom.

• He to Thorpe park.

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Challenge: Create 4 of your own questions beginning with ‘How long……?’

1.

2.

3.

4.

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“Every accomplishment starts
With the decision to try.” Gail Dever

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