Answer:
The learning about Universe is called
<u>Astronomy</u><u>.</u>
Explanation:
<h2>Hope it Helps you!! </h2>
Average speed of the first car= 15 miles/hr
Average speed of the second car= 30 miles/hr
Explanations:
distance= d= 90 miles
Time= 2 hrs
let speed of first cyclist= v
speed of second cyclist= 2v
relative speed = v + 2v= 3v
using relative speed= Total distance/Total time
3v= 90/2
3 v=45
v=15 miles/hr
so speed of first cyclist= 15 miles/hr
speed of second cyclist= 2 (15)= 30 miles/hr
Uh it's c) 0.5 :), and for some reason i need to write 20 characters to explain it well, okay you need to divide speed/wavelength, that's it
Infrared waves are further apart and ultra violeet are close together
