Physics help; please,please,please?!?

1.) To hear, which of the following takes place?





A) The ear senses vibrations in the air.


B) The ear amplifies the vibrations.


C) The ear transmits signals to the brain.


D) All of the above





2.) Because its molecules are far apart, sound waves will travel slowly through





A) Cold air.


B) Water.


C) Iron.


D) Copper.





3.) As the frequency of light waves increases,





A) the energy increases.


B) the energy decreases.


C) the energy stays the same.


D) the wavelength increases.





4.) Light rays reflecting off a smooth surface reflect





A) in one new direction.


B) in the intial direction.


C) in random direction.


D) None of the above.





5.) A virtual image





A) appears in front of a mirror


B) appears behind of a mirror


C) diffuses light


D) reflects light





6.) Most musical instruments produce sound through the vibration of





A) membranes.


B) air columns.


C) strings.


D) All of the above

Physics help; please,please,please?!?
1. D


2. A


3. A


4. D


5. B


6. C


best guess