First slide

Physical quantities and units

Question

One light year is defined as the distance travelled by light in one year. The speed of light $3 \times 10^{8} m s^{- 1} .$ The same in metre is

Easy

A

$3 \times 10^{12} m$
B

$9.461 \times 10^{15} m$
C

$3 \times 10^{15} m$
D

None of these

Solution

One light year $= 3 \times 10^{8} m / s \times 1 y r$
$= \frac{3 \times 10^{8} m}{s} \times 365 \times 24 \times 60 \times 60 s$
$= 3 \times 10^{8} \times 365 \times 24 \times 60 \times 60 m$
$= 9.461 \times 10^{15} m$

Get Instant Solutions

When in doubt download our app. Now available Google Play Store- Doubts App

Recieve an sms with download link

Doubts App

OR

SCAN ME

Doubts App

Doubts App