First slide

Measurement

Question

Express 1light year in terms of meters. What is its order of magnitude.

Moderate

A

16
B

26
C

6
D

36

Solution

$S p e e d o f l i g h t c = 3 \times 10^{8} m / s T i m e f o r o n e y e a r t = 1 y e a r = 365 \times 24 \times 60 \times 60 S e c o n d d i s \tan c e t r a v e l l e d b y l i g h t i n a y e a r = c t = 3 \times 10^{8} \times 365 \times 24 \times 60 \times 60 1 l i g h t y e a r = 0.9467 \times 10^{16} O r d e r o f m a g n i t u d e = 16$

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