It takes 5 years for light to reach the earth from A Star. Express the distance of Star from the earth in (a) Light year (b) km.

Open in App

Solution

(a) One light-year is the distance travelled by light in one year.
So in 5 years, it travels Five light-year distance.

(b) 1 light year = $9.461 \times 10^{12}$ km
so
5 light years = $4.73 \times 10^{13}$ km.

Suggest Corrections

Similar questions

What is the distance between stars expressed in light years? What do you understand nby the statement that a star is eight years away from the earth

A	B
(1) Speed of light	(a) 4.3 light years away from earth
(2) Light year	(b) 300,000 km/s
(3) Sun	(c) Nearest star
(4) Alpha Centauri	(d) distance travelled by light in one year
	(e) 18 light minutes away from the Earth

What is the distance of the star (in km) from which a light takes 3 x 10⁹ year to reach the earth? The speed of light, is C = 3 x 10⁸ m/s.

Join BYJU'S Learning Program