C I’m not that sure though
Answer:
26036485.6433 W/m²
Explanation:
E= Energy = 470 J
t = Time = 4 seconds
d = Diameter = 2.6 mm
Power is given by

Intensity is given by

The intensity of the laser beam is 26036485.6433 W/m²
Answer:bill 5 m/s. Jack:10 m/s
Explanation:
Cuz I took it
Answer:
light doesn't need a medium through which to travel because the speed of light is experimentally constant
I think it's A) Sunspots. I hope this helps:)