In which section of the graph is the water boiling?
[1 mark]
.2
Explain why the temperature does not change in section B, even though energy is still being transferred to the ice.
[2 marks]
.3
The mass of the ice is 0.50 kg. The specific latent heat of fusion of ice is 334 000 J/kg.
Calculate the energy needed to melt all of the ice.
[2 marks]
7 marksFoundation and Higher
Spec and skills
Original practice question
Answer and supported method checks
Waves travel across a pond. A floating leaf moves up and down 5 times in 2.0 s. The distance between neighbouring crests is 0.40 m.
.1
Calculate the frequency of the waves.
[1 mark]
.2
Calculate the speed of the waves.
[2 marks]
.3
Calculate the period of the waves.
[2 marks]
.4
The leaf moves up and down but does not travel across the pond with the waves.
Explain what this shows about the waves.
[2 marks]
4 marksFoundation and Higher
Spec and skills
Original practice question
Answer and supported method checks
Radium-226 decays by emitting an alpha particle:
88226Ra→ZARn+24He
.1
Determine the mass number A of the radon nucleus.
[1 mark]
.2
Determine the atomic number Z of the radon nucleus.
[1 mark]
.3
Strontium-90 decays by beta emission. Describe what happens in the nucleus during beta decay.
[2 marks]
5 marksFoundation and Higher
Spec and skills
Original practice question
Answer and supported method checks
A student hangs weights on a spring and measures its length each time.
Spring results. Weight added in newtons and total length in centimetres: 0 N, 20.0 cm; 1.0 N, 22.5 cm; 2.0 N, 25.0 cm; 3.0 N, 28.5 cm; 4.0 N, 30.0 cm; 5.0 N, 32.5 cm.
Weight added (N)
Length of spring (cm)
0
20.0
1.0
22.5
2.0
25.0
3.0
28.5
4.0
30.0
5.0
32.5
.1
Calculate the extension of the spring when the weight is 4.0 N.
[1 mark]
.2
Identify the anomalous result. Give the weight.
[1 mark]
.3
Use the other results to calculate the spring constant in N/m.
[2 marks]
.4
Suggest one way the student could make the length readings more accurate.
