Question

2. Light year is -------- a) 94.6 x 10 15 m. b) 9.46 x 1015 mm. c) 94.6 x 10 -15 m. d) 9.46 x 1015 m​

Answer 1

Answer:

Explanation:

ne light year is the distance of light at a speed 3×10  

8

m/s in 1 year.  

Thus, 1 light year =3×10  

8

m/s×1 year =3×10  

8

m/s×(365×24×3600s)=9.5×10  

15

m

According to rule of order of magnitude, as 9.5>5 so 9.5 will be taken as 10.

Thus, order of magnitude of one light year =10×10  

15

=10  

16

m

Answer 2

Answer:

Explanation:

Absolute zero temperature is _______