Question

Help with Science:) thanks!

Answer 1

1. In which medium does sound travel the fastest? (1 point)
salt water
fresh water
air
cast iron

2. A wave has a wavelength of 10 mm and a frequency of 5 hertz. What is its speed? (1 point)
50 mm/s
50 hertz/s
2 mm/s
0.50 mm/s

3. How does reflection differ from refraction and diffraction? (1 point)
Reflection is the only process in which the wave does not continue moving forward.
Reflection is the only process that involves a change in the wave.
Reflection affects all types of mechanical waves, but refraction and diffraction do not.
Reflection is the only process that changes the direction.

4. An ambulance siren sounds different as it approaches you than when it moves away from you. What scientific term would you use to explain how this happens? (1 point)
ultrasound
diffraction
rarefaction
the Doppler effect

5. The part of the ear that sends coded nerve signals to the brain is (1 point)
the outer ear.
the inner ear.
the middle ear.
the eardrum.

6. To what is amplitude related? (1 point)
the amount of energy carried by the wave
the maximum displacement from the rest position
neither of the above
both the first and the second choices above

Answer 2

What is giving you issue with these?

Answer 3

wow too much