General Knowledge - Physics - Discussion

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.

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.

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.

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.

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.

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.

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.

Light year means distance, it is used to measure the distance between any two eg:distance between the sun and the earth

Yes, light year is the unit of distance. It is the distance travelled by light in one year is called light year.

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.