Paragraph: (Science-textbook/science-g4-131.txt)
Sent 1: Sound waves are mechanical waves.
Sent 2: They can travel only through matter.
Sent 3: They cannot travel through empty space.
Sent 4: This was demonstrated in the 1600s by a scientist named Robert Boyle.
Sent 5: Boyle placed a ticking clock in a sealed glass jar.
Sent 6: The clock could be heard ticking through the air and glass of the jar.
Sent 7: Then Boyle pumped the air out of the jar.
Sent 8: The clock was still running, but the ticking could not be heard.
Sent 9: Thats because the sound couldnt travel without air particles to transfer the sound energy.
Sent 10: Is there any other place where sound cannot be heard?
Sent 11: Here is a hint: is there any other place that does not have air molecules?
Sent 12: Thats right, in space sound cannot be transferred.
Sent 13: So can astronauts hear each other?
Sent 14: Yes, they can, because they are in enclosed space stations or pressurized suits.In both cases, they are surrounded by air molecules.
Sent 15: If they left their space ship and did not use their electronics, they would not be able to hear each other.
Sent 16: Next time you watch a science fiction movie, think about this factoid.
Sent 17: When spaceships are destroyed by hostile alien beings, there would be no sound heard.
Sent 18: Sound waves can travel through many kinds of matter.

Question: Why can astronauts hear each other even if sound cannot be transferred in space? (false/additional)

They are in enclosed space stations or pressurized suits which means they are surrounded by air molecules
They have special electronics.
because they have special training
yes because there are air molecules in spce
because they yell

Question: Which scientist demonstrated that sound waves cannot travel through empty space by placing a ticking clock in a sealed glass jar? (false/challenge)

Boyle
Aristotle
Einstein

Question: In a science fiction movie when aliens destroy a spaceship why would there be no sound heard? (false/additional)

because there are no air particles for sound to travel to
in space sound cannot be transferred
no air molecules in space
because explosions are quiet in space
Because the air molecules are too dense in the space.
Because there is no air molecules on the earth.
because the aliens sucked up the sound

Question: How did Robert Boyle prove the properties of sound waves? (false/additional)

Explosition in an jar, which couldn't be heard.
boyle placed a clock in a jar with no air, there was no sound
With a clock in a jar of water, and there was no sound.
He removed the air from the inside of a ticking clock and it stopped making noise.
boyle proved with equations
yelling in a vacuum
a gun in space

Question: Why can't you hear in the vacuum? (false/additional)

There are no air particles.
Mechanical waves can only travel through matter.
sound is not as loud there
because your ears don't work there

Question: How do astronauts hear? (false/challenge)

through air in their spacesuits
They hear through air molecules in their spaceships.
Via electronics.
via headphones
through the atmosphere of space

Question: Can sound waves travel through empty space? (false/challenge)

No, only through matter.
definitely not
of course

Question: Who demonstrated that sound could not travel through empty space, but only matter? (false/additional)

Robert Boyle
an experiment under water
Aristotle
Albert Einstein

Question: In Boyle's experiment, what did he do to make the clock stop being heard while in the jar? (false/additional)

Question: How did Robert Boyle prove how sound waves travel? (false/challenge)

He placed a ticking clock in a jar and then removed the air from the jar.
an explosion under water
he put a clock in a box underwater
yelling in space
He didn't.

Question: How do astronauts hear each other? (false/challenge)

in enclosed areas
though electronics
They hear through air molecules in their spaceships.
They are in enclosed space stations or pressurized suits.In both cases, they are surrounded by air molecules, but if they left their spaceship and did not use their electronics, they would not be able to hear each other.
via pressurized air suits
Boyle carries them with his empty jar.
special training
via gravity
better hearing

Last updated: Mon Apr 16 04:55:33 EDT 2018
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