A particular star is at a distance of about - 8-1-10-13km- from the earth- Assuming that the light travels at - 3-10-8 m-sec- find how long does light take from that star to be reach the Earth-

Distance= 8.1 ×10^13km = 8.1 ×10^1310^3m speed = 8.1 ×10^16m Time = distan cespeed = 8.1 ×10^163 ×10^8 = 8.13×10^8 = 2.7 ×10^8 sec. ...

You visited us 29 times! Enjoying our articles? Unlock Full Access!

Byju's Answer

Standard XII

Physics

Units and Dimensions

A particular ...

Question

A particular star is at a distance of about $8.1 \times 10^{13} k m$ from the earth. Assuming that the light travels at $3 \times 10^{8} m / s e c$ , find how long does light take from that star to be reach the Earth.

Open in App

Solution

Distance= $8.1 \times 10^{13} k m$

$= 8.1 \times 10^{13} 10^{3} m$

speed $= 8.1 \times 10^{16} m$
$T i m e = \frac{d i s tan c e}{s p e e d} = \frac{8.1 \times 10^{16}}{3 \times 10^{8}}$

$= \frac{8.1}{3} \times 10^{8}$
$= 2.7 \times 10^{8}$ sec.

Suggest Corrections

Similar questions

Question 174

A particular star is at a distance of about $8.1 \times 10^{13} k m$ from the Earth.
Assuring that light travels at $3 \times 10^{8} m$ per second, find how long does light takes from that star to reach the Earth?

Q. A star is

8.1 \times 10^{13} k m

away from the earth. Suppose right travels at the speed of

3.0 \times 10^{5} k m

per second, how long will it take light from the star to reach the earth?

Q. If the light from star

A

takes

15

min to reach star

B

and the speed of light is

3 \times 10^{8} m / s

, then what is the distance between the stars?

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.

Q. The speed of light is about

2 \times 10^{5}

miles per second. The star Alpha Centauri is approximately

2.5 \times 10^{13}

miles from Earth. How many seconds does it take light to travel between Alpha Centauri and Earth?

Join BYJU'S Learning Program

A particular star is at a distance of about $8.1 \times 10^{13} k m$ from the earth. Assuming that the light travels at $3 \times 10^{8} m / s e c$ , find how long does light take from that star to be reach the Earth.

Distance= $8.1 \times 10^{13} k m$

$= 8.1 \times 10^{13} 10^{3} m$

speed $= 8.1 \times 10^{16} m$
$T i m e = \frac{d i s tan c e}{s p e e d} = \frac{8.1 \times 10^{16}}{3 \times 10^{8}}$

$= \frac{8.1}{3} \times 10^{8}$
$= 2.7 \times 10^{8}$ sec.

COURSES

EXAMS

CLASSES

EXAM PREPARATION

RESOURCES

COMPANY

FOLLOW US

FREE TEXTBOOK SOLUTIONS

STATE BOARDS

FOLLOW US

A particular star is at a distance of about 8.1×1013km from the earth. Assuming that the light travels at 3×108 m/sec, find how long does light take from that star to be reach the Earth.

Distance=8.1×1013km=8.1×1013103mspeed=8.1×1016mTime=distancespeed=8.1×10163×108=8.13×108=2.7×108 sec.

COURSES

EXAMS

CLASSES

EXAM PREPARATION

RESOURCES

COMPANY

FOLLOW US

FREE TEXTBOOK SOLUTIONS

STATE BOARDS

FOLLOW US

A particular star is at a distance of about $8.1 \times 10^{13} k m$ from the earth. Assuming that the light travels at $3 \times 10^{8} m / s e c$ , find how long does light take from that star to be reach the Earth.

Distance= $8.1 \times 10^{13} k m$

$= 8.1 \times 10^{13} 10^{3} m$

speed $= 8.1 \times 10^{16} m$
$T i m e = \frac{d i s tan c e}{s p e e d} = \frac{8.1 \times 10^{16}}{3 \times 10^{8}}$

$= \frac{8.1}{3} \times 10^{8}$
$= 2.7 \times 10^{8}$ sec.