Edexcel GCSE Physics 2011 Topics P3.2 and P3.3 test 15_16 with mark scheme

8/18/2019 Edexcel GCSE Physics 2011 Topics P3.2 and P3.3 test 15_16 with mark scheme

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[Part A]

Surname Name

American Academy Larnaca

Year 5 Physics

Semester 2 Test 1

Unit P3 App l icat ions of Physics

Topic 2 X-Rays and ECG’s

Topic 3Production, uses and risks of ionizing

radiation from radioactive sourcesDate: Wednesday 20/4/2016

Part A Time: 20 minutes

The Total Marks for this part is 20.

The Total Marks for the paper is 40.

The marks for each question are shown in brackets.Use this as a guide to how much time to spend on each question.

Questions labelled with an asterisk (*) are ones where the quality of your writtencommunication will be assessed.You should take particular care with your spelling and grammar, as well as theClarity of expression, on these questions.

Answer the questions in the spaces provided.There may be more space than you need.


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Q1.

(a) Which one of these statements about alpha radiation is correct?

Put a cross ( ) in the box next to your answer.(1)

A Alpha radiation has no charge.

B Alpha radiation is very ionising.C Alpha radiation travels very far in air.

D Alpha radiation is an electromagnetic wave.

(b) When an atom emits an alpha particle its nucleus changes.

Which describes the changes in the nucleus?



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Q2.

(a) The diagram shows the stability curve for nuclear isotopes.

Complete the sentence by putting a cross ( ) in the box next to your answer. An isotope above the curve will undergo β− decay because it has

(1)

A too few protons

B too many protons

C too few neutrons

D too many neutrons


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(b) Which statement is correct for β+ and β− particles?


A a β+ is positively charged and a β− is negatively charged

B the mass of a β+ is 1800 times the mass of a β− C the charge on a β+ is twice the charge on a β−

D a β+ is a proton and a β− is an electron

(c) Carbon-14 decays by emitting a β− particle to form an isotope of nitrogen.

Complete the nuclear equation for this decay by filling in the boxes.(2)

(d) Protons and neutrons both contain quarks.

Describe the arrangement of quarks in a proton.(2)

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(e) Explain what happens to a nucleus during β+ decay.

(2)

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Q3.

The photograph shows the security check-in at an airport.

An X-ray machine is used to scan luggage for dangerous items. A metal detector is used to check people for dangerous items.

(a) Suggest why people are not scanned with X-rays in an airport but have X-rays in a hospital.

(2)

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(b) Medical staff that uses radioactive materials needs more protection than their patients.

Describe some precautions that medical staff can take to ensure their safety from radioactive materials.

(3)

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Q4.

The diagram shows X-rays being produced when fast moving electrons hit a metal target.

(i) Complete the sentence by putting a cross ( ) in the box next to your answer.The X-rays that have most energy have the

(1)

A greatest mass

B highest frequency

C highest speed

D longest wavelength

(ii) Complete the sentence by putting a cross ( ) in the box next to your answer.Electrons travel to the target because it is

(1)

A magnetisedB negatively charged

C neutral

D positively charged(iii) Explain what is meant by thermionic emission.

(2)

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(iv) Suggest why there must be a vacuum in the glass tube.(1)

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Mark Scheme [Part A]

Q1.

Q2.


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Q3.

(b)


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Q4.

Answer Acceptableanswers

Mark

(i) B highestfrequency (1)

(ii) D positively

charged

(1)

(iii) an explanationlinking:

(when) thefilament isheated/very hot(1)with one of:

electrons escape(have enoughenergy) (1)

electrons escapefrom the surface (1)

cathode / metal (forfilament) released

accept boil offIGNORE produces /emits

(2)

(iv) a suggestion thatelectrons do notreach target

otherwiseelectrons collide

with (air) particleselectrons areabsorbedelectrons ioniseair stops electronsreaching target

(1)


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[Part B]

Surname Name

American Academy Larnaca

Year 5 Physics

Semester 2 Test 1

Unit P3 App l icat ions of Physics

Topic 2 X-Rays and ECG’s

Topic 3Production, uses and risks of ionizing

radiation from radioactive sourcesDate: Wednesday 20/4/2016

Part B Time: 20 minutes

The Total Marks for this part is 20.

The Total Marks for the paper is 40.

The marks for each question are shown in brackets.Use this as a guide to how much time to spend on each question.

Questions labelled with an asterisk (*) are ones where the quality of your writtencommunication will be assessed.You should take particular care with your spelling and grammar, as well as theClarity of expression, on these questions.

Answer the questions in the spaces provided.There may be more space than you need.


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Q1.

Many different types of radiation are used by doctors.

Which type of radiation comes from radioactive sources?

Put a cross ( ) in the box next to your answer.

(1)

A gamma rays

B ultrasound

C ultraviolet

D X-rays

Q2.

Pulse oximeters and ECGs are used to monitor the blood oxygen levels and heart activity of a patient.

(a) Pulse oximeters are often attached to a finger.They use both red and infrared light.

Which of these is correct for red light and infrared radiation?

Put a cross ( ) in the box next to your answer.

(1)

A infrared radiation is ionising, red light is not ionising

B red light can travel through a finger, infrared cannot travel through a finger

C red light has a shorter wavelength than infrared

D red light is ionising, infrared is not ionising

(b) A student investigates absorption of light.

Here are the results obtained, showing the intensity of light at the detector for different thicknesses of

absorber.


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Complete the graph of intensity (y -axis) against thickness ( x -axis).

Two points have been plotted.(i) Plot the remaining points.

(2) (ii) Draw a curve of best fit.

(1)

(iii) Find the thickness of the absorber that reduces the intensity of the light to 50% of its originalvalue.

(1)

........................................................... mm


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(iv) Estimate the intensity of the background light during the investigation.(1)

........................................................... mW/cm2

Q3.

Radiotherapy is often used for palliative care when cancers are incurable.

Explain how using radiotherapy in this way is helpful to patients.

(2)

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Q4.

The photograph shows a pulse oximeter. This is used to show the heart rate and the amount of oxygenin the blood.

(a) (i) There are two LEDs used in an oximeter.One emits visible light.State what type of radiation the other LED emits.

(1) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. . . . . . . . . . .

(ii) The oximeter shows a heart rate of 89 beats per minute.Calculate the frequency in beats per second.

(2)

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(iii) Calculate the time between each heartbeat.Use the equation

(2)

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*(b) Doctors use an electrocardiogram (ECG) machine to monitor the action of a person's heart.Describe how a doctor can use an ECG machine to collect and display information from a person's

beating heart in order to check heart action.You may draw a labelled diagram to help with your answer.

(6)

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Mark Scheme [Part B]

Q1.

Q2.


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Q3.


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Q4.

Answer Acceptableanswers

Mark

(a)(i) infrared (1) red light (1)

(a)(ii) 89/60 (1) 1.5(beats/second) (1)

1.48(beats/second) Allow 1.491.483333etc Accept correctanswer no workingfor 2 marks (2)

(a)(iii) 1/1.5 (1) 0.67(s) (1) ecf1/ 89 one mark only Accept correctanswer no workingfor 2 marks (2)

Indicative Content Mark

QWC *(b) A descriptionincluding some ofthe following points:what the information/ signal is

electrical signals

small differencein potential (mV)between one part ofthe body andanother

signal changesas the heart beats

are started in theheart (right atria)

caused bynervous impulse

actionpotentialssignal in

electrodesattached to the skin

water in the body

conducts electricity /signal

at least twoelectrodes used

electrodesconduct electricity /contain gelsignal out

shows heart rateon a screen / paper

shows awaveform on ascreen / paper (6)


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receives smallsignals which haveto be amplified

Level 0 No rewardable content

1 1 - 2

a limited explanation e.g. it shows yourheart beat on a screen

the answer communicates ideas usingsimple language and uses limited scientificterminology

spelling, punctuation and grammar areused with limited accuracy

2 3 - 4

a simple explanation e.g. it shows if yourheart is working properly by measuring heartbeat which you can see on a screen

the answer communicates ideasshowing some evidence of clarity andorganisation and uses scientific terminology

appropriately spelling, punctuation and grammar areused with some accuracy

3 5 - 6

a detailed explanation e.g. connectselectrodes/wires on the skin to measure(electrical) signals of the heart in order toassess the heart beat/heartperformance/heart condition

the answer communicates ideas clearlyand coherently uses a range of scientific

terminology accurately spelling, punctuation and grammar areused with few errors

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Edexcel GCSE Physics 2011 Topics P3.2 and P3.3 test 15_16 with mark scheme