AI Mentor

Check Your IQ

Free Expert Demo

Try Test

Courses

Dropper NEET Course Dropper JEE Course Class - 12 NEET Course Class - 12 JEE Course Class - 11 NEET Course Class - 11 JEE Course Class - 10 Foundation NEET Course Class - 10 Foundation JEE Course Class - 10 CBSE Course Class - 9 Foundation NEET Course Class - 9 Foundation JEE Course Class -9 CBSE Course Class - 8 CBSE Course Class - 7 CBSE Course Class - 6 CBSE Course

Offline Centres

A specific star is located approximately $8.1 × 1013$ km from Earth. The light should travel ____ seconds from that star to the Earth while assuming that it moves at the speed of light.

see full answer

Your Exam Success, Personally Taken Care Of

1:1 expert mentors customize learning to your strength and weaknesses – so you score higher in school , IIT JEE and NEET entrance exams.

An Intiative by Sri Chaitanya

(Unlock A.I Detailed Solution for FREE)

Best Courses for You

JEE

NEET

Foundation JEE

Foundation NEET

CBSE

Detailed Solution

A specific star is located approximately

8.1 × 1013

km from Earth. The light should travel

2.7 × 108

seconds from that star to the Earth while assuming that it moves at the speed of light.
Star’s distance from the earth

= 8.1 × 1013

km
Speed of light

= 3 × 108 m / sec

Converting distance in m with, 1km=1000m

= 8.1 × 1013 × 1000 m

Using the exponent law,

= 8.1 × 1016

Time

= d i s tan c e s p e e d

(formula)
Substituting the values
Time

= 8.1 × 1016 3 × 108

Using the exponent law,

a m a n = a m − n

= 8.1 × 108 3 = 2.7 × 108

= 2.7 × 108

So, light travels from that star to the Earth in

2.7 × 108

sec.

Watch 3-min video & get full concept clarity

courses

No courses found

Result Producing online coaching for JEE/NEET of south India

Largest All India Test Series for JEE/NEET

Best Online Course for IIT JEE

Best Online Course for NEET

Best Online Course for CBSE

Ready to Test Your Skills?

Check your Performance Today with our Free Mock Test used by Toppers!

Take Free Test

Get Expert Academic Guidance – Connect with a Counselor Today!