A string telephone works very much like a landline phone. When you talk into the cup your voice sends sound waves inside the cup, vibrating the bottom of the cup. The vibrations are transferred to the string, across the string and into the bottom of the other cup.
Does the cup and string telephone actually work?
The old “two cans and a string” technique (or better yet, “two paper cups and a string”) really does work. The key is to make sure that the string is tight between the two cups, and this normally means that the distance is limited and the two people have to be connected to each other by a straight line.
HOW FAR WILL cup phones work?
The cups can be used to communicate over distances of up to 100 feet.
What kind of cup is best for cup phones?
You’ll need two cans or cups. These can be recycled soup cans, plastic party cups or paper cups. The cups will help transmit the sound — keep notes and find out which cup works best!
What string works best for tin can phone?
You will need 2 empty tin cans, a hammer, a nail or screw, masking or duct tape, and a long piece of cotton string or fishing line, about 10 to 30 feet in length.
How do you communicate with cups and strings?
Thread one end of string through the bottom of each cup. Place a paperclip or toothpick in the bottom of each cup and tie the loose end of the string around it (the clip or pick is just here to keep the string from slipping through the bottom of the cup). Give one cup to your conversation partner and hold one yourself.
Does a string telephone work around corners?
The signal can be directed around corners with at least two methods: The first is to create a loop in the string which is then twisted and anchored to another object.
How long can a tin can phone be?
The longest functioning tin can telephone is 242.62 m (796 ft), and was achieved by Puzz Lab Inc., SUSUMU Inc., Gakken Plus Co. Ltd., Roy Hobbs Inc. and Hirofumi Yumoto (all Japan) in Chosei, Chiba, Japan, on 17 August 2019. They were not only successful but also the very first holder of this record title.
How do sounds travel from one cup to another?
Sound waves are compression, or longitudinal, waves. If one speaks into a cup, the sound waves of their voice vibrate the back of the cup, which propagates as longitudinal waves down the string to the other cup.
What happens when sound waves reach the other end of the cup?
What happens when the vibrations (sound waves) reach the other end of the cup? (Answer: It is the reverse of what happened on the other side: the waves in the string vibrate the cup; the vibrations from the cup disturb the air, like a pebble being thrown into still water; the vibrations in the air, otherwise known as …
How do you make a soup can telephone?
Hold one tin can, and give the other tin can to someone else. Walk away from each other until the string between the can is taut. Speak into the open end of one can while your partner listens to the open end of his can. Switch it around and listen.
When did they stop using tin cans?
In 1995, the US FDA issued a rule prohibiting lead soldered food cans, including both domestic and imported food cans.
What string works best for tin can phone?
You will need 2 empty tin cans, a hammer, a nail or screw, masking or duct tape, and a long piece of cotton string or fishing line, about 10 to 30 feet in length.
How does sound travel from one cup to another?
Sound waves are compression, or longitudinal, waves. If one speaks into a cup, the sound waves of their voice vibrate the back of the cup, which propagates as longitudinal waves down the string to the other cup.
How sound travels through a string telephone?
When you make a string telephone, you talk into it causing the bottom of the cup to vibrate and that vibration travels along the string to the other cup where they can hear the sound of your voice coming out of their cup.
