3. Waves
A section of Physics, 0625
Listing 10 of 1440 questions
Underline the most appropriate value below for the speed of sound in water. 1.5 m / s 15 m / s 150 m / s 1 500 m / s 15 000 m / s Sound travels in water as a series of compressions and rarefactions. Describe what is meant by a compression and by a rarefaction. compression rarefaction An echo-sounder sends out a pulse of sound to determine the depth of the sea bed. It measures the time between sending out the pulse and receiving its echo. shows a boat using an echo-sounder. echo sea bed pulse of sound 12 m echo-sounder The sea bed is 12 m below the echo-sounder. Use your value for the speed of sound in water from to calculate the time between the sending out of the pulse and receiving its echo. time = The boat passes over a region of the sea bed of the same depth, where the reflection of sound waves is weaker. State whether there is an increase, a decrease or no change in the amplitude and pitch of the reflected wave. amplitude pitch
0625_w14_qp_33
THEORY
2014
Paper 3, Variant 3
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A group of students are taking measurements so they can calculate the speed of sound. The students and their teacher are outside. The teacher holds two blocks of wood and the students have stop-watches. The teacher stands a long distance from the students, as shown in . All the students can see the teacher clearly. teacher blocks of wood (not to scale) The teacher claps the two blocks of wood together to produce a loud sound. The students measure the time interval between seeing the teacher clap and hearing the sound. shows three of the stop-watches. The stop-watches show three of the values recorded for the time interval. 00:01.27 00:01.34 00:01.44 Calculate the average value for the time intervals shown on the stop-watches in . average time interval = s State the name of the instrument needed to measure the distance between the teacher and the students. The distance between the teacher and the students is 415 m. The average time for the sound to travel between the teacher and the students is 1.29 s. Calculate the speed of sound. speed of sound = m / s
0625_w21_qp_33
THEORY
2021
Paper 3, Variant 3
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Two girls attempt to measure the speed of the water in a river, as shown in . bridge 1 bridge 2 50 m The distance between the two bridges is measured as 50 m. Suggest an appropriate instrument that they might use to measure this distance. The girl on bridge 1 drops a piece of wood into the water. The girl on bridge 2 measures how long it takes for the piece of wood to reach bridge 2. It takes 400 s to travel between the two bridges. Name an appropriate instrument that could be used to measure this time. Describe the procedure for measuring this time. Calculate the speed of the water. speed =
0625_w11_qp_21
THEORY
2011
Paper 2, Variant 1
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Two people watch a storm cloud above a tree. Person A is watching from her house and person B is watching from a distant hill. Lightning creates a bright flash and loud thunder at the same time. The lightning strikes the tree not far from person A’s house, as shown in . A B lightning For each person, describe the time interval between seeing the lightning and hearing the thunder and explain your answers. person A description of time interval person B description of time interval explanation
0625_w16_qp_33
THEORY
2016
Paper 3, Variant 3
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Questions Discovered
1440