If the average life of a person is taken as 1 | vedclass

Name: Exam Paper Generator | JEE NEET Paper Generator | Vedclass
Brand: Vedclass
Rating: 5 (35 reviews)

Question

(A) The actual average life of a human is approximately $70$ years,which is about $2.2 	imes 10^9 \, s$. For the purpose of order of magnitude,we tak

Vedclass · Accepted Answer

$10^{10}$

Vedclass · Answer

(A) The actual average life of a human is approximately $70$ years,which is about $2.2 	imes 10^9 \, s$. For the purpose of order of magnitude,we take it as $10^9 \, s$.The actual age of the universe is approximately $13.8$ billion years,which is about $4.35 	imes 10^{17} \, s$. For the purpose of order of magnitude,we take it as $10^{17} \, s$.Let the scale factor be $k$. According to the problem,the human life on this scale is $100 \, s$.Therefore,$k 	imes (10^9 \, s) = 100 \, s$,which gives $k = 10^{-7}$.Now,the age of the universe on this scale is $k 	imes (10^{17} \, s) = 10^{-7} 	imes 10^{17} \, s = 10^{10} \, s$.

If the average life of a person is taken as $100 \, s$,the age of the universe on this scale is of the order of ...... $s$.

Similar Questions

The hottest type of stars are called

The speed of recession of a galaxy is proportional to its distance.

How does the red shift confirm that the universe is expanding?

“The universe is expanding” means

The angle of maximum elongation for Venus is $47^\circ$. The distance of Venus from the Sun in $AU$ is .......

Vedclass Test Series

Exam Paper Generator

Online Exam Module