# General Knowledge - Physics - Discussion

### Discussion :: Physics - Section 1 (Q.No.7)

7.

Light year is a unit of

 [A]. time [B]. distance [C]. light [D]. intensity of light

Explanation:

No answer description available for this question.

 Vivek said: (Oct 12, 2010) 1 light year is equal to 9460730472580.8 km.

 Karthikeyan said: (Jan 9, 2011) Light year mean distance traveled by light in one year.

 Sabari said: (Jan 10, 2011) Light year is used to measure the distance between the heavenly bodies in space.

 Chandrahas Verma said: (Jun 9, 2011) LIGHT YEAR= DISTANCE TRAEVELLED IN ONE YEAR* NO. OF YEARS

 Rama Raju said: (Jun 18, 2011) Light year is The distance traveled by light in space for 1 year with the speed of 3 lack KM per sec. And it is a measure of distance for spacecrafts.

 Aditya Pawar said: (Oct 30, 2011) It is unit of distance used in Astronomy or distance traveled by ray of light in Vaccum during 1 year.

 Subradeep said: (Feb 26, 2012) The light year means the light travels the distance in 1 year ..in quantum physics light it treated as a photon particle ,the rest mass of the photon is zero.and it's has speed of light,C since form classical mechanics S=VT { v be the velocity ,and T be the time and S be the distance )_____________________{1} for photon V=C and for light year T=365 days =365*24*3600 sec if s be the distance that light/photon travels in 1 year the s follows form the equation 1. so if c in SI units that S has the unit of meter.

 Jhansi said: (Apr 20, 2012) The distance travelled by the light in one year is called Light year,so Light year is a unit of distance.

 Vivetha.H said: (May 12, 2012) Light year means distance, it is used to measure the distance between any two eg:distance between the sun and the earth

 Ankur Sharma said: (Jun 24, 2012) 1 light year is equal to 9.64*10^15m.

 Priti said: (Nov 14, 2012) Yes, light year is the unit of distance. It is the distance travelled by light in one year is called light year.

 Sundeep said: (Mar 12, 2013) Light year is a unit used to measure astronomical distances.

 Madhav said: (Jun 30, 2013) Light year is a unit of distance 'and one light year is 9.46*10^15m.

 Sandeep said: (Jul 26, 2013) Yes distance traveled by light in one year is called light year.

 Ravi Kumar said: (Aug 10, 2013) Yes light year is the unit of distance travel by light in one year.

 Kalyan said: (Oct 7, 2013) 1 light year = distance travel by light in one year.

 Payal said: (Jan 8, 2014) A light year is unit of distance to measure long distances like distances b/w stars. Because it becomes so difficult to measure distances in kilometers. 1 light year = 9.46*10^12 Km. It is a distance traveled by a light in one year. The nearest star to earth next to sun is Alpha Centauri which is about 4.3 light years away. The brightest star of our sky is Siris and is 8.6 light years away from us.

 Bhavana said: (Jan 26, 2014) Light year is used to measure the distance travelled by the light in one year.

 Asim said: (Mar 25, 2014) Light is energy that can travel 3*10^8 m/s. 1 lightyear = 3*10^8*365*24*3600 = 9.4608*10^15 m = 9.4*10^12 km.

 Abhi said: (Mar 29, 2014) 1 light year equals to 90000000000000 km the unit is in km which is the unit of distance so 1 light year is a distance travelled by light in one year.

 Mohan Raj said: (Jul 5, 2014) Light year means, Eg: When we travel at a speed of light(3*10^8m/s) we will cover the distance of sun in 8sec.

 Ram Mohan said: (Nov 28, 2014) Yes it's correct, light travels in one year is called light year, we can measure the distance.

 Devan said: (Apr 14, 2015) Light is the fastest one till today so we use light to measure the distance of heavenly bodies by knowing their speed in free space.

 Amit Sharma said: (Aug 8, 2015) It is very big unit of distance that's why we can not use in daily life.

 Abc said: (Sep 22, 2015) 1 light year = 1.0 cm/m square.

 Daniel said: (Nov 17, 2016) Yes, a light year is a distance travelled by light in a year.

 Lokesh said: (Dec 16, 2016) Distance travelled by a light in one year in vaccum.

 Preangka said: (Jan 4, 2017) Light year is normally a distance.

 Sathiya said: (Feb 28, 2017) Distance travelled by a light in one year in vacuum. Distance travelled = velocity of light * one year 1 light year = 9.467 *10^15 m.

 Sai Manoj@Sm said: (Apr 25, 2017) Light year means a light is the distance travelled in one year is 1 light year and it is used to measure distance so, one light is equal to 9.4 *10^15.

 Mimie said: (Apr 29, 2017) B is correct. I agree.

 Alok Yadav said: (Sep 22, 2017) It might be light also because distance is a scalar quantity.

 Yesvanth said: (Aug 8, 2018) Unit described as a distances between objects in the universe.

 Desalegn Degu said: (Mar 2, 2019) A light year is the unit of actual distance.