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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
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a) Bats Navigate in the dark
b) Elephants communicate over large distances
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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
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4.
(4)
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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)
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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
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(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)
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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
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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
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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)
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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 %
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2.
(1)
(1)
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2. Refraction is: ______________________________________
______________________________________ (1)
3.
4. Describe the effect of white light passing through a triangular prism
(1)
(2)
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5.
(1)
(2)
(2)
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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
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3.
(1)
(1)
(1)