(music plays)

Aldo stands next to a wall touch screen showing the logo of the program. He is in her mid-thirties, clean-shaven with short blond hair. He wears glasses and a blue T-shirt with a print that reads "Home Work Zone."

He says HEY TVO
KIDS,
IT'S TEACHER
ALDO HERE, AND TODAY,
I'M GOING TO BE
TALKING TO YOU
ABOUT THE
SCIENCE OF SOUND!
DID YOU KNOW THAT
SOUND IS
ACTUALLY
MEASURED IN A UNIT
CALLED DECIBELS?

A drawing pops up on the screen. It shows a rule with numbers and objects.

He continues IF WE TAKE A LOOK AT
OUR SMARTBOARD HERE,
I'VE GOT A
CONTINUUM WHICH
SHOWS DIFFERENT
LEVELS OF SOUND
IN OUR EVERY
DAY LIVES.
IF YOU LOOK AT THE
START OF OUR CONTINUUM,
WE HAVE A
LEAF,
AND THAT
REPRESENTS THE LEAVES
BLOWING OUT
IN NATURE.
THAT'S USUALLY
AT A DECIBEL SOUND
OF TEN.
WHEN WE LOOK AT
THE MUSICAL NOTES,
THAT REPRESENTS SOFT
PLAYING MUSIC
OR WHISPERING
FROM PERSON TO PERSON,
THAT'S USUALLY AT A
SOUND OF 20 DECIBELS.
TRAFFIC PASSING
OUTSIDE OF
OUR
APARTMENT WINDOWS,
THAT'S USUALLY AT A
SOUND DECIBEL OF 85,
AND YOU THINK
ABOUT A
REALLY LOUD MAKING
SOUND, AN AIRPLANE,
THAT'S AT ABOUT
140 DECIBELS.
SO THERE'S AN
EXAMPLE OF HOW
SOUND IS ON A
CONTINUUM.
THE IMPORTANT
THING TO REMEMBER
IS THAT SOUND NOT ONLY
TRAVELS IN AIR,
BUT IT ALSO
TRAVELS IN OTHER
STATES OF MATTER, FOR
EXAMPLE, WATER.
THINK ABOUT ALL
OUR SEA CREATURES
THAT LIVE IN THE
SEAS OR OCEANS.
THEY ACTUALLY
USE ECHOING TO
TRANSMIT SOUND WAVES
UNDERWATER,
TO LET THEM KNOW
WHERE TO FIND FOOD.
SO THERE'S ANOTHER
EXAMPLE
OF HOW SOUND WAVES
MOVE OUTSIDE OF AIR,
BUT IN
WATER.
THE LAST THING
THAT I WANT
TO TALK
TO YOU ABOUT
IS HOW SOUND CAN
TRAVEL THROUGH
SOLID OBJECTS.
THINK ABOUT AN
OPERA SINGER
WHO'S ABLE
TO SHATTER A GLASS
BY HER HIGH PITCHED
VOICE.
THERE'S AN
EXAMPLE OF SOUND WAVES
GOING THROUGH A
SOLID MATTER.
NOW I'VE GOT A
QUESTION FOR YOU,
TVO KIDS,
IS THERE ANYWHERE
THAT YOU COULD THINK,
WHERE THERE IS
NO SOUND?
IN
OTHER WORDS,
A SOUND WITH A DECIBEL
READING OF ZERO?
WELL THERE'S
ONE PLACE THAT I
KNOW OF AND THAT'S
OUTER SPACE.
YOU SEE, OUTER
SPACE HAS NO AIR,
THERE IS NO
WATER,
AND THERE
IS NO MATTER,
SO THAT MEANS THERE'S
NO SOUND.
THAT MEANS
ZERO DECIBELS.
SO THERE'S A LITTLE
BIT ABOUT THE
SCIENCE
OF SOUND.
I HOPE YOU
ENJOYED IT.
I'M TEACHER ALDO AND
NOW YOU KNOW.