Question

Express the average distance of each from the sun in
1. lightyear--
2. parsec--

Answer 1

1.

1 Parsec = 3.086 × 1016 meters

1 lightyear = 9.46 × 1015 meters

Distance between sun and earth is = 1.52 × 1011 m

Now,

In Parsec, it is = 4.9 × 10-6 Parsec

In Lightyear it is = 1.6 × 10-5 Lightyear

2.

Size of an atom = 10-10 m

Atom is scaled up to 1 m

Size of a nucleus = 10-14 m

It will be scaled up to say ‘x’.

Now,

(10-10)/1 = (10-14)/x

=> x = 10-4 m

Then, 10-4 would be the size of the nucleus.

Answer 2

A parsec is the distance at which 1 AU would subtend an angle of 1 second of arc. A light year is the distance that light, that travelling through a vacuum with a speed of 186,000 mi/s would cover in 1 year.


Earth to sun distance -- 

1.633 x 10 minus 5 light years (.00001633 light years 
5.007 x 10 minus 6 light years (.000005007 parsecs)