Light/sound and hearing
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1 Medway LEA Advisory Service Light/sound and hearing 8K & 8L 26 min 27 marks Q1-L3, Q2-L4, Q3-L4, Q4-L5, Q5-L5, Q6-L6 1. Thunder and lightning happen at the same time. (a) We see the flash of lightning before we hear the thunder. Give the reason for this (b) Omar investigated the movement of a storm. He measured the time between seeing a flash of lightning and hearing the thunder. He did this six times. Omar put his results in a table. flash of lightning time between seeing the lightning and hearing the thunder, in seconds A 8.0 B 5.0 C 3.0 D 9.0 E 13.0 F 16.5 Medway LEA Advisory Service 1
2 Omar drew a bar chart of his results as shown below. time, in seconds A B C D E F flash of lightning (i) (iii) On the bar chart, draw a bar for flash D. Use a ruler. Which flash of lightning was closest to Omar? Give the correct letter.... Describe how the distance between the storm and Omar changed as the storm moved between flash A and flash F. Maximum 4 marks Medway LEA Advisory Service 2
3 2. The diagram shows a lamp and a piece of cardboard. The piece of cardboard has a hole in it. Light from the lamp passes through the hole and forms a bright spot on a wall. piece of cardboard wall A B lamp hole C D E (a) (i) Which point on the wall, A B, C, D or E, is lit up by the lamp?... Explain why the other points on the wall are not lit up by the lamp (b) A piece of clear green plastic is placed over the hole. What is the colour of the light which shines on the wall?... Medway LEA Advisory Service 3
4 (c) The diagram shows a ray of light from a lamp hitting a mirror. P Q R S mirror lamp Which arrow, P, Q, R or S, shows the reflected ray?... Maximum 4 marks Medway LEA Advisory Service 4
5 3. Sound levels are measured in decibels (db). The graph shows the recommended maximum times people should listen to sounds of different levels. At longer times there could be serious damage to hearing recommended maximum listening time each day, in hours sound level in decibels (db) (a) What is the maximum time each day for listening to a personal stereo at 96 db? hours (b) In what way could a sound of more than 120 db damage the ear?.... Medway LEA Advisory Service 5
6 (c) (i) Sally works for five hours in a nightclub. What should the maximum sound level be in the nightclub so that her hearing is not damaged? Use the graph to find your answer. db How can ear plugs protect Sally s ears?.... Maximum 4 marks 4. (a) A teacher shines a laser beam onto a classroom window. It reflects off the window and onto a screen. screen window laser beam On the diagram above, continue the laser beam to show its path as it reflects off the window and onto the screen. Use a ruler. Add arrows to show the direction of the laser beam. 2 marks Medway LEA Advisory Service 6
7 (b) (i) When a pupil plays her flute in the classroom the window vibrates. Give the reason for this. When the window vibrates, what happens to the laser beam that is reflected off the window? (c) The teacher places a microphone near the pupil as she plays her flute. The diagram below shows the pattern on an oscilloscope screen. Medway LEA Advisory Service 7
8 The pupil then plays her flute at a higher pitch and more quietly. Which diagram below shows the pattern that would be seen on the oscilloscope? Tick the correct box. A B C D maximum 5 marks 5. Nadia is on her bicycle, waiting to pull out from a road junction. Michael is driving his car round the bend. A row of houses stops Nadia from seeing Michael's car. not to scale Medway LEA Advisory Service 8
9 (a) At what position will Michael's car be when Nadia first sees it? Tick the correct box. A B C D (b) A row of shops was built opposite the junction. The shops have glass windows which act as a mirror. not to scale Nadia could see Joan's motorbike reflected in the glass window. (i) On the diagram above, draw a ray of light to show how Nadia can see Joan's motorbike reflected in the glass window. Add arrows to the ray. Use a ruler. How does the glass window help to reduce the number of accidents? 3 marks Maximum 5 marks Medway LEA Advisory Service 9
10 6. (a) Jacquie has a mobile phone. Energy is stored in the battery of the phone. The drawing shows the battery being charged. (i) Which energy transfer takes place in the battery as it is being charged? Tick the correct box. chemical to sound electrical to chemical sound to thermal thermal to electrical When the battery is fully charged, Jacquie unplugs the phone. Which energy transfers take place when the mobile phone rings? Tick the correct box. chemical to electrical to sound electrical to chemical to sound kinetic to electrical to sound thermal to electrical to sound Medway LEA Advisory Service 10
11 (b) Jacquie can change the ring-tone of her phone. The diagrams below show the patterns made by four sound waves on an oscilloscope screen. They are all drawn to the same scale. Write the letter of the sound wave that matches each of the descriptions below. (i) a loud sound with a low pitch... a quiet sound with a high pitch... (iii) a loud sound with a high pitch... 3 marks Maximum 5 marks Medway LEA Advisory Service 11
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