Question

the sun- to-earth distance is 150,000,000,000 m. calculate the time (in minutes) it takes for the sun's UV rays to travel that distance. ​

Answer 1

Given:

Sun to Earth distance is equal to 150,000,000,000 m.

To find:

Time taken by UV rays to travel this distance.

Calculation:

Velocity of any electromagnetic wave (UV rays, etc) in vacuum is 3 × 10⁸ m/s.

So, let time taken be t :

$\therefore \: t = \dfrac{distance}{speed}$

$= > \: t = \dfrac{150000000000}{3 \times {10}^{8} }$

$= > \: t = \dfrac{15 \times {10}^{10} }{3 \times {10}^{8} }$

$= > \: t = \dfrac{15 \times {10}^{2} }{3 }$

$= > \: t = 5 \times {10}^{2}$

$= > \: t = 500 \: sec$

$= > \: t = \dfrac{500}{60} \: min$

$= > \: t = 8.33 \: min$

So, time taken for UV rays to travel the distance between sun and earth is 8.33 min.