An ambulance driving 50.0 m/s emits a sound wave with a wavelength of 80.0 centimeters. As it drives toward a hospital, which of the following is the only possible frequency heard by the medical staff who are standing at the entrance? Speed of sound is 343 m/s.

502 Hz

Explanation:

Initial frequency, F is given by F=v/w where f is frequency, v is speed of sound in air and w is wavelength. Therefore, substituting 80cm whicj is 0.8 m for w and 343 m/s for v then

F=343/0.8=428.75 Hz

The frequency at entrance, f will be given by

where va is speed of ambulance, v is speed of sound in air, F is initial frequency. Substituting 343 m/s for v, 428.75 Hz for original frequency and 50 m/s for speed of ambulance then

you cant move and you feel like someones pushing you down onto your bed it can feel like you want to get up but you just can't it can be extremely scary

it would be c. predictability