What is the wavelength of a sound wave if the air is 20 degrees Celsius, and the frequency is 100 Hz? Question 9 options:

41.16 m

3.52 m

None of these.

3.43 m

2000 m

22. the effect of threshold braking is to a cause skids. b. lock wheels. c. prevent locking of wheels. d. increase stopping distance.

Apebble is thrown into a calm lake, ripples are formed from the center and move outward. the water particles in the lake travel in a circular pattern that moves up and down on the surface of a lake, and the energy travels a) diagonally. b) downward. c) horizontally. d) upward.

Which planets are visible without a telescope