As you stand near a railroad track, a train passes by at a speed of 30.9 m/s while sounding its horn at a frequency of 218 Hz. What frequency do you hear as the train approaches you

Amplify and switch electrical power and electronic signals

Wooden , walls ,doors ,support

The best answer is (a) which is universal law is in effect at all times. it is constantly at play in everything we do and governs our lives. it is also important to note that universal law applies to not only everything on earth, but everything in the universe as well, which is another reason why it is in effect at all times.

Ihope you find the answer