Sunday

December 21, 2014

December 21, 2014

Posted by **KD** on Tuesday, September 13, 2011 at 5:07am.

1.how many centimetres is equivalent to a light-nanosecond

2. How long is an astronomical unit (AU) in light-minutes (1min, i.e., the distance that light travels in a vacuum in one minute)?

Please show the calculation if there is any

Thanks

- Astronomy -
**bobpursley**, Tuesday, September 13, 2011 at 5:28am1. speedlight*time= distance

3E8m/s*1E2cm/m*1E-9sec=3E1 or 30 cm

2. speedlight*time=distance

3E8m/s*60sec= ?

- Astronomy -
**drwls**, Tuesday, September 13, 2011 at 7:01am2. Sunlight reaches Earth in 8.3 minutes. The Earth-Sun distance is therefore 8.3 light-minutes.

One way to get the answer is to divide the Earth-Sun distance by the distance travelled by light in one minute, using the same units.

**Answer this Question**

**Related Questions**

Astronomy - Hi, I asked about converting light minutes to light years and was ...

physics - In astronomy, distances are often expressed in light-years. One light-...

astronomy - How many light minutes are in a light year?

Astronomy - Light travels at a constant speed of 3.0 x 105km/s. The distance ...

Astronomy - Light travels at a constant speed of 3.0 x 105km/s. The distance ...

MATH - A light year is the distance that a light travels through a vacuum (space...

Astronomy - Based on what you learned about light, select all of the correct ...

Math - Light travels approximately one foot in a nanosecond. How far does light ...

physics - light travels at a constant speed of 3x10^11 cm /sec how long does it ...

Physics - light travels at a constant speed of 3x10*11 cm/sec. how long does it ...