Physics 9702/34 — October/November 2014

Cambridge AS Level · Advanced Practical Skills · worked solutions for every part, with the mark scheme

questions

marks

120

minutes

Topics Manipulation, Measurement and Observation · Presentation of Data and Observations · Analysis, Conclusions and Evaluation

Q1Manipulation, Measurement and ObservationPresentation of Data and ObservationsAnalysis, Conclusions and EvaluationFree sample

In this experiment, you will investigate the refraction of light by a transparent block.

(a)

You are provided with a sheet of paper with lines marked as shown in Fig. 1.1.
The sheet is attached to a board.
Stick a pin vertically into the board on the line AB approximately 3 cm to the right of A. Stick another pin vertically into the board at C.

Fig. 1.1

(b)

(i)

View the two pins horizontally from the direction shown in Fig. 1.2. Stick the third pin into the board on the curved line so that it is in line with the first two pins.

Fig. 1.2

(ii)

Measure and record the perpendicular distance $p$ from the third pin to the line DE, as shown in Fig. 1.2.

$p$ = ______ $\text{cm}$

(iii)

Remove the third pin from the board.

(c)

(i)

Place the semicircular block on the board with its centre mark next to the pin at C, as shown in Fig. 1.3.

(ii)

View the first two pins horizontally from the direction shown in Fig. 1.3. Look at the bottom of the first pin through the block. Stick the third pin in the board on the curved line so that it appears to be in line with the first two pins.

Fig. 1.3

(iii)

Measure and record the perpendicular distance $q$ from the third pin to the line DE, as shown in Fig. 1.3.

$q$ = ______ $\text{cm}$

(iv)

Remove the third pin and the block from the board.

(d)

Move the first pin to a different position on the line AB. Repeat (b) and (c) until you have six sets of values of $p$ and $q$ .

Include values for $\frac{q}{p}$ and $\frac{1}{p}$ in your table.

10M

(e)

(i)

Plot a graph of $\frac{q}{p}$ on the $y$ -axis against $\frac{1}{p}$ on the $x$ -axis.

(ii)

Draw the straight line of best fit.

(iii)

Determine the gradient and $y$ -intercept of this line.

gradient = ______
$y$ -intercept = ______

(f)

The quantities $q$ and $p$ are related by the equation

\frac{q}{p} = \frac{a(1 - b)}{p} + b

where $a$ and $b$ are constants.

Using your answers from (e)(iii), determine the values of $a$ and $b$ . Give units where appropriate.

$a$ = ______
$b$ = ______

The rest of this paper

1 more questions

Q2Manipulation, Measurement and Observation · Analysis, Conclusions and Evaluation · Presentation of Data and Observations20M

Loading the full paper…