Winter 2P - 2022

Question 1

A solid changes state by melting at a certain temperature

For phosphorus, this change of state occurs at 44*C

Sketch how the temperature of a sample of phosphorus changes when it os heated at a constant rate from -40C to 80C (3)

Answer 1

Question 2

Two nuclei are close together and stationary

Explain why these nuclei will move apart (2)

Answer 2

(Nuclei are) positively charged

Like charges repel

Question 3

Describe the conditions needed for fusion to occur in the core of a star (2)

Answer 3

High temperature

High pressure

Question 4

A student investigated how the strength of the magnetic field from a solenoid changes with distance from the end of the solenoid

The diagram shows the solenoid connected to a power supply

. The student uses a device called a hall probe, which can be placed anywhere in the magnetic field to measure its strength at that point

Design a suitable method for the investigation, include:
. Any extra measuring equipment
. Independent, dependant and any control variables

You may include a diagram in your answer (5)

Answer 4

. Ruler

. Measure magnetic field at different distances

. Repeat and average

. Distance= independent variable

. Magnetic field strength = dependant variable

. Current, nmbr. of turns in coil = control variable