Question 21 Mark$1$ nano second =……….s.Answer$1$ nano second $= 10^{-9} s$View full question & answer→
Question 31 Mark1 mean solar day = _______ s.Answer1 mean solar day = 86400 sView full question & answer→
Question 71 Mark$1$ micron= ____$\mathring A$Answer1micron $=10^{4} \mathring A$View full question & answer→
Question 91 Mark$1$ light year= ________ mAnswer$11$ i ght year=$ 9. 46x10^{15} m$View full question & answer→