QDynamicPage List

0 4

A student investigated the insulating properties of different materials.

Figure 4 shows some of the equipment used by the student.

Figure 4

This is the method used:

1. Wrap insulating material around the can.

2. Put a fixed volume of boiling water in the can.

3. Place the lid on the top of the can.

4. Measure the time taken for the temperature of the water to decrease by a fixed

amount.

5. Repeat steps 1–4 using the same thickness of different insulating materials.

0 4 . 1

Identify the independent variable and the dependent variable in this investigation.

[2 marks]

Independent variable

Dependent variable

The student used two different types of thermometer to measure the temperature

changes.

Figure 5 shows a reading on each thermometer.

Figure 5

0 4 . 2

What is the resolution of thermometer B?

[1 mark]

Resolution =

°C

0 4 . 3

Thermometer A is more likely to be misread.

Give one reason why.

[1 mark]

Question 4 continues on the next page

0 4 . 4

For one type of insulating material, the temperature of the water decreased from

85.0 °C to 65.0 °C.

The energy transferred from the water was 10.5 kJ.

specific heat capacity of water = 4200 J/kg °C

Calculate the mass of water in the can.

Use the Physics Equations Sheet.

[3 marks]

Mass =

kg

0 4 . 5

Table 2 shows the results for two insulating materials.

Table 2

Material

Time for temperature to decrease by 20 °C

in seconds

X

450

Y

745

Explain how the results in Table 2 can be used to compare the thermal conductivity of

the two materials.

[2 marks]

Turn over for the next question

Figure 2 shows a ripple tank that a student used to investigate water waves. Figure 2

The student adjusted the speed of the motor so that the bar hit the water more times each second.

0 3 . 1

0 3 . 2

Describe how the frequency of the water waves in the ripple tank can be measured.

[2 marks]

What happened to the frequency of the waves produced? Tick one box.

DecreasedDid not change Increased

[1 mark]

Do not write outside the box

06

IB/G/Jun18/8463/2F

7

PMT

0 3 . 3 The student measured the frequency of the water waves as 5 hertz. Calculate the period of the water waves.

Use the equation:

Choose the unit.

metres

period =

metres / second

1 frequency

seconds

[3 marks]

Period =

Unit