Answer:
127 times
Step-by-step explanation:
v = speed of eruptive prominence = 150 km/s = 150,000 m/s
t = time interval = 3 hours = 3 x 60 x 60 sec = 10800 sec
d = distance traveled by photosphere
Distance traveled is given as
d = v t
d = (150,000) (10800)
d = 1.62 x 10⁹ m
d = 1.62 x 10⁶ km
D = diameter of earth = 12742 km
n = number of times the distance traveled by eruptive prominence
using the equation
d = n D
1.62 x 10⁶ = n (12742)
n = 127 times