Amplify the sound
Purpose of the experiment:
How can we hear faint sounds?
List of materials:
- a rubber hose with a length of approx. 1.5-2 m and a diameter of approx.1 cm
- two funnels, different sizes will be fine
- a wind-up watch or alarm clock with hands
- a sticky tape
- Put the watch approx. 2 m in front of you.
- Check if you can hear the ticking.
- Using the sticky tape, attach the funnels to the ends of the hose.
- Attach the watch to one of the funnels using the sticky tape.
- Go as far as you can from the watch/clock holding the other funnel in your hand.
- Put the funnel to your ear.
Questions to the experiment:
- What sounds can be heard using the constructed apparatus?
- To what distance is it possible to send the collected sounds?
Description of the phenomenon:
- By means of a stethoscope, a doctor can hear the sounds that the body makes, in particular the heart and lungs,.
- The first stethoscope had a form of a wooden funnel-shaped tube with a flat earpiece. The inventor of stethoscope was the French doctor René Laennec; he came up with his invention in 1816.
- Other applications of the stethoscope include examining clockwork mechanisms or mechanisms used in vaults and safes.