CIE iGCSE Co-Ordinated Science P3.4 Sound Exam Style Questions Paper 3
Question
6. (a) (iii) The sound waves travel 80 m. The speed of sound in water is 1600 m/s. Calculate the time taken for a sound wave to travel 80 m in water.
▶️Answer/Explanation
Answer: 0.05 s
Sub-topic Code: P7.1 (Sound)
Detailed Solution: Time = distance / speed = 80 m / 1600 m/s = 0.05 s.
6. (b) (i) Describe the motion of the dolphin between time = 0 and time = 5 s in Fig. 6.2.
▶️Answer/Explanation
Answer: accelerating / speed increasing
Sub-topic Code: P1.1 (Motion)
Detailed Solution: The dolphin is accelerating, as its speed increases over time from 0 to 5 seconds.
6. (b) (ii) State the maximum speed of the dolphin as shown on the graph.
▶️Answer/Explanation
Answer: 6 m/s
Sub-topic Code: P1.1 (Motion)
Detailed Solution: The maximum speed of the dolphin, as shown on the graph, is 6 m/s.
6. (b) (iii) Calculate the distance travelled by the dolphin between time = 15 s and time = 30 s.
▶️Answer/Explanation
Answer: 45.0 m
Sub-topic Code: P1.1 (Motion)
Detailed Solution: The distance travelled is the area under the speed-time graph between 15 s and 30 s. This is a triangle with base = 15 s and height = 6 m/s. Area = 0.5 × base × height = 0.5 × 15 × 6 = 45.0 m.
6. (c) Describe the process of evaporation using ideas about particles.
▶️Answer/Explanation
Answer: fast moving / most energetic particles; escape from surface of liquid
Sub-topic Code: P4.1 (Thermal Properties)
Detailed Solution: Evaporation occurs when the most energetic particles at the surface of a liquid gain enough energy to escape into the gas phase. This leaves the remaining liquid cooler.