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Exercise 1

Luminous objects produce their own light, while non-luminous objects do not. The book being read is a non-luminous object that is being lit by a nearby luminous object like a lamp or the sun. Three non-luminous objects that could be classified are a table, chair, and wall. When thunder and lightning occur, we see the flash of lightning before hearing the thunder because light travels faster than sound. The closer the lightning is to the observer, the shorter the time between seeing the flash and hearing the thunder.

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Lutfi D.A
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205 views2 pages

Exercise 1

Luminous objects produce their own light, while non-luminous objects do not. The book being read is a non-luminous object that is being lit by a nearby luminous object like a lamp or the sun. Three non-luminous objects that could be classified are a table, chair, and wall. When thunder and lightning occur, we see the flash of lightning before hearing the thunder because light travels faster than sound. The closer the lightning is to the observer, the shorter the time between seeing the flash and hearing the thunder.

Uploaded by

Lutfi D.A
Copyright
© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
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Download as DOCX, PDF, TXT or read online on Scribd
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Exercise 1

Light
1. State the difference between luminous and non-luminous objects.

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2. What is the luminous object which providing light for you to read this question?

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3. Classifying three non-luminous objects.

_____________________________________________________________________

_____________________________________________________________________

_____________________________________________________________________

4. Thunder and lightning happen at the same time.


(a) We see the flash of lightning before we hear the thunder. Give the reason for this.

____________________________________________________________________

(b) Omar investigated the movement of a storm. He measured the time between
seeing a flash of lightning and hearing the thunder. He did this six times. Omar
put his results in a table.

flash of time between seeing the


lightning lightning and hearing the
thunder, in seconds
A 8.0
B 5.0
C 3.0
D 9.0
E 13.0
F 16.5
Exercise 1
Light
Omar drew a bar chart of his results as shown below.

18
16
14
12
time,in 10
seconds 8
6
4
2
0
A B C D E F
flash of lightning

(i) On the bar chart, draw a bar for flash D. Use a ruler.

(ii) Which flash of lightning was closest to Omar? Give the correct letter.

_____________________________________________________________________

(iii) Describe how the distance between the storm and Omar changed as the storm moved
between flash A and flash F.

_____________________________________________________________________

5. Complete the diagrams below.

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