can u explain how to workout the answer to this question 1 A laser emits light of wavelength 600nm.
What is the distance, expressed as a number of wavelengths, travelled by the light in one
second?
A 5 × 108
B 5 × 1011 C 5 × 1014 D 5 × 1017

Question

can u explain how to workout the answer to this question 1 A laser emits light of wavelength 600nm. 
What is the distance, expressed as a number of wavelengths, travelled by the light in one 
second? 
A 5 × 108
B 5 × 1011 C 5 × 1014 D 5 × 1017

anonymous · Answer

d = distance
D = 600nm
c = 3x10^8 m/s
t = 1 s

v=d/t
d=v*t
d=(3*10^8 m/s)*(1 s)
d=3*10^8 m

n: How many D's "fit" inside d (d expressed as n*D).
d=n*D
n=(3*10^8 m)/(600*10^-9 m)
n= 0,005*10^17
n= 5*10^14

C) 5x10^14