Question

Why do we need standard units of measurements? (3 marks)
b. Ruchi needs a piece of ribbon of one cubit length for decoration purpose. She sent her brother to buy it , she didn’t get the desired length. What do you think went wrong? What could have been done to get the exact measurement? (Give reason)

Answer 1

Explanation:

Time taken by quasar light to reach Earth = 3 billion years 

                         =3×109 years=3×109×365×24×60×60 s

Speed of light =3×108 m/s

Distance between the Earth and quasar =(3×108)×(3×109×365×24×60×60)

                                                                    =283824×1020 m=2.8×1022 km