Question 24
You are going to investigate whether sound requires vibrations to travel.
Work in groups of three.
You will need:
- 2 disposable cups, a sharp object to make a small hole in the bottom of each cup, a string long enough to go across the classroom, scissors to cut the string
Safety
Take care when using the sharp object to make a hole in the cups.
1 Pass the string through the holes in the cups so that the open ends of the cups face away from each other. Make the string as long as possible.
2 Secure the string inside each cup by tying a knot.
3 Set up the equipment as shown in the diagram. This is sometimes called a string telephone.
4 Pull the string tight between the cups.
5 The person speaking puts the cup over their mouth.
6 The person listening puts the cup over their ear.
7 Speak as quietly as possible, so that the person hears the sound of your voice through the string.
8 Let the string go slack. Say the same thing, with the same loudness, when the string is slack.
9 Pull the string tight again. The third member of the group should grip the string in their hand. Do this around the middle of the string and then in different places.
10 Say the same thing, with the same loudness, when the string is being gripped.
Questions
6 It is very difficult to speak with the same loudness each time. Suggest an improvement for this so that the investigation is a fair test.
Work in groups of three.
You will need:
- 2 disposable cups, a sharp object to make a small hole in the bottom of each cup, a string long enough to go across the classroom, scissors to cut the string
Safety
Take care when using the sharp object to make a hole in the cups.
1 Pass the string through the holes in the cups so that the open ends of the cups face away from each other. Make the string as long as possible.
2 Secure the string inside each cup by tying a knot.
3 Set up the equipment as shown in the diagram. This is sometimes called a string telephone.
4 Pull the string tight between the cups.
5 The person speaking puts the cup over their mouth.
6 The person listening puts the cup over their ear.
7 Speak as quietly as possible, so that the person hears the sound of your voice through the string.
8 Let the string go slack. Say the same thing, with the same loudness, when the string is slack.
9 Pull the string tight again. The third member of the group should grip the string in their hand. Do this around the middle of the string and then in different places.
10 Say the same thing, with the same loudness, when the string is being gripped.
Questions
6 It is very difficult to speak with the same loudness each time. Suggest an improvement for this so that the investigation is a fair test.
