CHAPTER 6) EAR - THE SOUND MACHINE
1.1
stretched
balloon
Rubber band
- Plastic cup
FA Pencil
I shoebox
metal plate
1. What does the first experiment demonstrate?
2. What do you understand from the second experiment?
1.2 Compare the stretched membrane of first experiment to any of our body part t
vibrated when sounds are produced. Which is the body part?
Answers
Answer:
the first experiment shows the vibration in one second
First experiment demonstrates working of ear drum.
Second experiment demonstrates working of guitar.
Stretched membrane in first experiment resembles ear drum.
In first experiment, when metal plate is beaten, it causes vibration in stretched balloon or membrane. This causes jumping of rice grains. The experiment is usually performed to educate children about the harm and movement of ear drum with respect to noise.
High noise causes stress in memebrane, which can result into breaking the membrane or weakening the body part.
Second experiment shows varying pitch produced due to difference in length of bands. Varying length of rubber bands are tied, and made to vibrate.
Voice starts from high pitch and end at low pitch. Shorter lengths of bands move with high frequency and larger lengths move with low frequency.