Question

I don't know if anyone saw my questions, so I'll ask again. I'm in need of quick help.


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The table shows the speed of sound waves in different materials. Sound
would travel most quickly through ______.

wood****(?)
water
air
outer space


*Table shown in screenshot, Lightshot is a Secure site*

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The table shows the thermal conductivity of some common materials.
Which would be the best insulator?

diamond
gold
lead
concrete*****(?)

*Table shown in screenshot, Lightshot is a Secure site*


What is an echo?
the absorption of sound waves
the transmission of sound waves
the reflection of sound waves****(?)
the vibration of sound waves

Which is an example of the flow of heat through conduction?
Hot air rises to the top of a room.
A hot-air balloon rises into the sky.
Heat flows from a hot liquid to a pot handle.****(?)
Heat causes winds to blow from the water to the land.


Thanks,

~A, for Anonymous.

Answer 1

all correct.

Answer 2

Thank you! I can't believe I actually did okay!

Answer 3

You didn't. Check the first one again. Which substance on the list is less dense and is not a vacuum? (that's the answer)