0

Unit 5: Being a Physicist

Homework

S1/2 CfE Science

Homework Date

due

Parent/Guardian

Signature Mark

1 – Waves & Sounds /13

2- Analysing Sound /11

3- Heat & the EM Spectrum /14

4- Conduction & Cooling down /13

5- Convection & Radiation /12

6- Heat loss in the home /9

7- Reflection & Refraction /15

8- Sight & Sight defects /7

Parental Comments

1

1. Fill in the blanks

a) All waves transfer _________ (1)

b) Two examples of waves are:

o ___________________

o ___________________ (1)

c)

(1)

d) The ______________ of a wave shows how much

_____________ is in a wave. (1)

2. Describe an experiment to measure the energy in a water wave.

Homework 1 MARK /13 %

Comment / Grade

Find out more....

(2)

2

3. Fill in the blanks

Sounds travel by ________________

Sounds can travel through ____________, ___________ and

__________ but not through a __________ because there are no

____________. (3)

Describe and experiment to prove that sound can travel through liquids. (2) Explain how a ‘cup-and-string’ telephone works

(2)

3

1. Fill in the blanks 1. The _________ of a sound is a measure of how many times an

object vibrates per second.

The units used to measure frequency are called _____. (1)

2. Sounds above the human range of hearing are known as

_________. They can be used to see____________ in the

womb or to find objects under the _______. (1)

You may need to do some research to help you with this homework – Find out:

2.

(2)

(2)

Homework 2 MARK /11 %

Comment / Grade

Find out more....

a) Bats Navigate in the dark

b) Elephants communicate over large distances

4

3.

(1)

(1)

(1)

5

4.

(1)

(1)

6

1. Fill in the blanks

All waves in the electromagnetic spectrum travel at the same

______. This is _______________ meters per second. (1)

2. By applying your knowledge explain why you can see a firework

exploding before you hear it exploding?

(1)

3. Fill in the blanks (1)

Homework 3 MARK /14 %

Comment / Grade

Find out more....

7

4.

(4)

8

5. Fill in the blanks

a. Heat is a form of ________. (1)

b. _____________ is a measure of how hot or cold something

Is and is measured with a __________. (1)

c. Heat can travel easily through _________ but not through

__________. (1)

d. Metals are generally ______ conductors of heat. (1)

e. _________ and __________ are both insulators. (1)

6. Explain why cooking pots are often made of metal, but their handles are often made of plastic.

(2)

9

1. Fill in the blanks

a. Heat energy travels from _______objects to _________objects. (1)

b. Heat can travel through solids by _______________

Heat travels by conduction because the touching particles

_____________ (1)

c. Metals are _________conductors of heat and non-metals are

________conductors (i.e. ____________). (1)

2. A chef wants to find out which type of cooking is best at conducting

heat– stainless steel or copper-bottomed pots. Design an experiment to find out which metal is a better conductor.

Homework 4 MARK /13 %

Comment / Grade

Find out more....

(4)

10

3. The graph below shows how most substances cool after being taken away from the source of heat.

Answer the following questions In the graph:

a) Where is the heat loss the greatest: A, B, C or D? ___ (1)

b) What is the temperature at point C? ___ (1)

c) What is room temperature? ___ (1)

d) What is happening at points A, B and C?______________ (1)

e) On the same graph, add two cooling lines with the following

characteristics:

i. same starting temperature, higher room temperature (1)

ii. higher starting temperature, lower room temperature (1)

11

1. Fill in the blanks

a. In a fluid, (liquid or gas), heat travels mostly

by________________. (1)

b. In convection, hot fluid ____________ (1)

2. In the diagram opposite, use

arrows to show a convection current. (2)

3. Explain why heated particles rise in hot water (2)

Homework 5 MARK /12 %

Comment / Grade

Find out more....

12

4. Fill in the blanks

a. A lid reduces heat loss by ________________

All hot objects emit heat as rays called _____________radiation. (1)

b. Infra-red radiation can travel without____________ being

present.

Infra-red radiation travels very ___________ (1)

5.

a. _____________ and _______________surfaces are good at

giving out and absorbing infra-red radiation (1)

b. ____________ and ______________surfaces make poor emitters and absorbers of infra-red radiation. (1)

6. Explain why cars and buildings in hot countries are often painted

white

(2)

13

The diagram below shows some ways in which heat is lost in the home and also what can be done to reduce heat loss. The table below shows how long it takes for each of these energy saving features to pay for the cost of installing them.

Energy saving feature Time to pay for itself

Solar panels 12 years

Double glazing 10 years

Shutters 8 years

Conservatory 15 years

Cavity wall insulation 5 years

Loft insulation 3 years

Homework 6 MARK /9 %

Comment / Grade

Find out more....

solar panels painted matt black

shutters to close at night

conservatory facing south

loft floor covered in glass fibre containing air

double glazed window

cavity walls filled with foam containing air bubbles

14

1. Use the table on the previous page to help you answer the following

questions

a. Which energy saving feature is the most cost effective?

_________________________________________ (1)

b. Which energy saving feature is the least cost effective?

_________________________________________ (1)

c. Which feature relies on a renewable form of energy?

_________________________________________ (1)

d. Which feature might be the most useful near an airport?

_________________________________________ (1)

You may need to do some research to help you with this homework 2. Explain how the energy saving features listed below help to save heat

energy:

a. Conservatory facing south

____________________________________________________ ____________________________________________________ (1)

b. Solar panels painted matt black

____________________________________________________ ____________________________________________________ (1)

15

c. Loft floor covered in glass fibre containing air

___________________________________________________ ___________________________________________________ (1)

d. Double glazed windows

___________________________________________________ ___________________________________________________ (1)

e. Cavity walls filled with foam containing air bubbles

__________________________________________________ __________________________________________________ (1)

16

1. Light is a _______ (1) Complete the diagrams below

a.

(1) b.

(1)

c.

(1)

Homework 7 MARK /15 %

Comment / Grade

Find out more....

17

2.

(1)

(1)

18

2. Refraction is: ______________________________________

______________________________________ (1)

3.

4. Describe the effect of white light passing through a triangular prism

(1)

(2)

19

5.

(1)

(2)

(2)

20

6.

1. Fill in the blanks

a. In normal sight, light enters the eye through the

______ and is the focused on to the _________

by the ______. (1)

b. The ______ changes size depending on the amount

of _______ entering the eye. (1)

c. The _______ protects the eye.

2. Complete the diagram below for normal sight Label the following: cornea, iris, pupil, lens, retina, optic nerve (2)

Homework 8 MARK /7 %

Comment / Grade

Find out more....

21

3.

(1)

(1)

(1)