The focal length, like you said it's the distance between the FOCAL point and the mirror.
Hope this helps.... :)
Answer: A. True
Explanation:
I'm not all the way sure, so please don't hate on me. I looked it up to double check and it should be true.
!PLEASE NOT HATE IF IT'S WRONG!
Answer is: d. increases.
<span>The velocity of sound in seawater changes with water pressure, depth, temperature and salinity.
</span>Velocity can be calculeted using Del Grosso's equation, the UNESCO equation (<span>International Standard algorithm)</span> or <span>Mackenzie equation.
To measure velocity navy use </span>Expendable Bathy Thermograph.
The only one example of a chemical change would be:
B. Leaving cheese out to get moldy.
Because there is a chemical reaction.
