A discovery not the others
Answer:
time machine popularized the concept of time travel by mechanical means. Yes a long time ago, mahal
Answer:
A) Speed
Explanation:
The medium of transmission(air) does not change before and after reflection. The sound still travels in air after the reflection. i.e the medium of transmission of sound is constant.
Since the medium of transmission remains constant, speed also remains constant. Speed only changes when the medium of transmission changes.
