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II Edexcel GeEI rPhysicsI Advanced SubsidiaryI Unit 38: Exploring Physics

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I. International Alternative to Internal AssessmentTuesday 10 January 2012 - Morning Paper ReferenceTime: 1 hour 20 minutes 6PH07/0 1

Write your name here

(surname IOther names

~u must have: 1[T_,~~]IRuler\_---------------------------~

Instructions

Use black ink or ball-point pen. Fill in the boxes at the top of this page with your name,

centre number and candidate number. Answer all questions. Answer the questions in the spaces provided

- there may be more space than you need.

Information

The total mark for this paper is 40. The marks for each question are shown in brackets

- use this as a guide as to how much time to spend on each question. The list of data, formulae and relationships is printed at the end of this booklet. Candidates may use a scientific calculator.

Advice

Read each question carefully before you start to answer it. Keep an eye on the time. Try to answer every question. Check your answers if you have time at the end.

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C2012Pearson Education Ltd.

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SECTION A

Answer ALL questions.

For questions 1-5, in Section A, select one answer from A to D and put a cross in the box ~.H you change your mind, put a line through the box it and then

mark your new answer with a cross ~.

1 A student is trying to determine his reaction time. He takes the following readings:

0.20 s, 0.18 S, 0.19 s, 0.08 s -I ' .:j-1,

-Questions 4 and 5 refer to the circuit below.

A

The variable resistor is used to change the current. A graph is drawn with potential difference on they-axis and current on the x-axis .

. 4 Which of the following would give the emf of the cell?

0 A area under the graph

0 B gradient of the graph

0 C intercept on the x-axis

1&1 D intercept on the y-axis

----(Total for Q!lestion 4 = 1 mark)

5 Which of the following would give the ~tude of the internal resistance of the cell?

o~

oo

A area under the graph

B gradient of the graph--

C intercept on the x-axis -D intercept on the y-axis -

TOTAL FOR SECTION A = 5 MARKS

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SECTIONB

Answer ALL questions in the spaces provided.

6 A student is asked to determine the resistance of a wire.

The student has to decide whether to measure the resistance directly, using a digitalmultimeter, or indirectly, using an analogue ammeter with an analogue voltmeter. Theresistance is known to be between 5 Q and 15 Q.

2 3

~

n Q A Q 5

Ii} IDigital multimeter Analogue ammeter Analogue voltmeter

Discuss the advantages and disadvantages of each method of measuring the resistance.

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MA~!&~M@jjlp/.t,~Jt, __1?~~~l~_~~~_~if/:IxJ~ml!)8iV(a.~/:tf1~Ii2~~!;:mm

(Totatfor Question 6 = 5m~r~)

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-,7 A student is asked to determine the viscosity of an oil at room temperature by dropping

ball bearings into a long measuring cylinder filled with the oil.

The student is given the equation:

2 2gv=-r -(Pb-P )

91/0

Where

v = velocity of ball bearingr = radius of ball bearing" = viscosity of the oil

----- measuring cylinder

-1----- oil

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The student has been given values for the density of the oil Poand the density of the ballbearings Pb.

Write a planfor an experiment which could be used to determine the viscosity of the oilusing standard laboratory apparatus and a graphical method.

You should:

(a) list any additional apparatus required, you may add to the diagram if you wish,

(b) state the quantities to be measured,

(c) for two of these quantities state and explain your choice of measuring instrument, .

(d) state which is the independent and which is the dependent variable,

(e) explain how the data collected will be used to find the viscosity,

(1) identify the main sources of uncertainty and/or systematic error,_.'\

(g) comment on safety.

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-. 8 In an experiment to determine the Planck constant h, a student used the apparatus shown

below.

U lampfilter

photoelectric cell

For different wavelengths of electromagnetic radiation, she adjusted the potential divideruntil the current was zero and then recorded the potential difference. Her results areshown below.

(a) Criticise these results.

Wavelength/nm Potentialdifference VN

510 0.14470 0.36430 0.67370 1

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(b) Complete the table below by calculating the missing frequency.

WavelengthInm

Potentialdifference VN

Frequencyf11014 Hz

510 0.14 5.9I' __ ~n' ,~,,,.~~ __ _. _ _ ~' ._.

470 0.36 6.4

(c) Plot the values of potential difference Von the y-axis against frequency f on thez-axis on the graph paper below. Draw a straight line of best fit on your graph.

VI'\}lo

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-(d) The student has been given the equation

eV=hf-

Explain why the graph of Vagainstfis a straight line and how the gradient can beused to find a value for the Planck constant

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(e) Use the gradient of your graph to determine the Planck constant... .\

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-- --------------------------------------r )I (t) Explain how you could use a graph of Vagainstfto find a value for the constant 4>. iI f")"t -iI \-, ,

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TOTAL FOR SECTION B = 35 MARKS

TOTAL FOR PAPER = 40 MARKS

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