Question

speed of light is 3*10 ^8 m/s . what is the distance travelled by light in one hour

Answer 1

Answer:

speed of light is 3 x 10^8 m/s. 365×24×60×60×(3×10^8)=9.4608e12.

Answer 2

Answer:

1.08×10⁹ km

Explanation:

$\huge{ \sf \blue{Given:-}}$

• Speed of Light = 3 × 10⁸ m/s

$\huge{ \sf \blue{To \: Find:-}}$

• Distance travelled by light in one hour ( 1 hour = 3600 seconds)

$\huge{ \sf \blue{Solution:-}}$

$\large \bold{ \mathfrak{We \: know \: that, \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: }} \\ \large \bold{ \mathfrak{{ \: \: \: \: \: \: \: \: \: \: \: \: \: Distance = Speed \times Time }}}$

$\huge{ \bold{\sf{ = 3 \times {10}^{8} \times 3.6 \times {10}^{3} }}} \\ \\ \huge{ \sf{ = (3 \times 3.6) \times ( {10}^{8 + 3} )}} \\ \\ \huge{ \sf{ = 10.8 \times {10}^{11} \: m \: \: \: \: \: \: \: \: \: \: \: }} \\ \\ \huge\bold \red{1m \: = \frac{1}{1000} \: km \: \: \: \: \: \: \: \: \: \: } \\ \\ \huge{ \sf{ = \frac{108 \times {10}^{11} }{10 \times 1000} \: km \: \: \: \: \: \: \: \: \: }} \\ \\ \huge{ \sf{ = \frac{108 }{100} \times \frac{ {10}^{11} }{ {10}^{2} } \: km \: \: \: \: \: \: \: \: \: }} \\ \\ \huge{ \sf{ = \underline\pink {1.08 \times {10}^{9} \: km } \: \: \: \: \: \: \: \: \: \: \: }}$

$\underline{ \huge{ \mathrm{\green{Note:-}}} }$ $\sf{ 1 hour = 3600 seconds = 3.6 × {10}^{3} s }$ $\text{1 km = 1000 m \: \: \: \: \: \: \: \: \: \: \: \: \: \: } \sf{ {a}^{m} \times {a}^{n} = {a}^{m + n} \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: }$ $\sf{a^x÷ a^y= a^{x - y} \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: }$