45 minutes corresponds to
of hour. There are 25 waves per hour, so we must find how many waves there are in
of hour. Therefore we can write the following proportion:
and by solving ,we find
So, the surfer should expect almost 19 waves in 45 minutes.
Move toward to the observer
Answer:
The law of reflection of sound waves states that the angle of incidence is always equal to the angle of reflection. But unlike reflection of light on a highly smooth surface, in the reflection of the sound wave, a part of the incident wave gets transmitted to the medium where it hits.
It's a bunch of lines. Each line starts at one Pole, curves around, and ends at the other Pole. There are a lot of them. (I hope this is not too long or complicated.)
The hydrosphere (water) runs off onto the lithosphere (Earth's surface) as it evaporates into the atmosphere.
