Which waves can travel through empty space?
A. Light waves
B. Water waves
C. Sound waves
D. Mechanical waves

Aplane flies directly between two cities, a and b, which are separated by . from a to b, the plane flies into a headwind. on the return trip from b to a, the wind velocity is unchanged. the trip from b to a takes less than the trip from a to b. what is the airspeed of the plane, assuming it is the same in both directions

During takeoff, the sound intensity level of a jet engine is 170db at a distance of 34 m. what's the sound intensity level at a distance of 1.0 km?

Pls pls pls pls ! describe, in your own words, how you found the epicenter of the earthquake.