Page 39 - (DK) How to be a GENIUS?

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Can you hear something? From whispering voices You cannot hear any sounds in
to a phone ringing, yours ears pick up all sorts of space. This is because sound
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sounds. Try the following activities and find out how
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needs a medium to travel el
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much information we process through our ears. n e eds a m ed i u m to tr ve l
through, such as air or water.
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er
r.
t h ro u g h , s u c h a s a i r o r wa t er .
What was that? Noisy bottles
Test your hearing You will need: ([SHULPHQW ZLWK You will need:
ǩ 3DSHU
ability by identifying ǩ 7DSH high- and low- ǩ 7KUHH HPSW\
these challenging ǩ 6FLVVRUV pitched sounds glass bottles
sounds. ǩ 7KUHH HPSW\ ERWWOHV when you do ǩ 3LWFKHU RI ZDWHU
ǩ 8QFRRNHG ULFH this activity.
ǩ 'ULHG EHDQV
ǩ 8QFRRNHG SDVWD
ǩ (PSW\ EDJ
ǩ )ULHQGV WR SDUWLFLSDWH
ep 1
Ste
Fill each bottle with a
dif fferent amount of water,
dif
eaving one empty. If
le
ep 1
Ste y ou blow across the top
Fil ll each bottle with a o f the empty bottle, it
different material—the makes a low-pitched
m
d d
uncooked rice, dried so ound. If you add a little
quid and then blow, the
beans, and uncooked liq
ch is higher—the more
pasta. Let the participants pitc
hear each shaken bottle liquid, the higher the pitch.
liquid
once. Then wrap them in
paper before placing
t
them in the bag.
Step 2
If you tap the sides
of the same bottles,
Step 2 you get the opposite
Ask your volunteers s s effect: the empty
to close their eyes a and bottle has the
pick the bottles out, highest pitch, while
one by one. Can the ey the fullest bottle
identify what is has the lowest pitch.
inside the bottles
by shaking them?
There is less air when the bottle is half
full, so the air vibrates faster, with higher pitch.
When the bottle is empty, the vibration is slower
and the pitch lower. But when you tap the bottle,
How good is your sense of hearing? it is the glass and water that are vibrating to
Throughout your life, your brain stores create the sound. The greater the amount
information it encounters, enabling you to of water, the lower the pitch.
identify the sounds you come across.
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