R P Goyal and S P Tripathi Solutions for Chapter: Measurements and Experimentation, Exercise 1: EXERCISE–1 (A)

$\mathrm{Ly}$ is the unit of :

The wavelength of light of a particular colour is $5800 \stackrel{0}{\mathrm{A}}$. Express it in nanometre and metre.

The size of bacteria is $1 \mathrm{\mu m}$. Find the number of bacteria in $1 \mathrm{m}$ length.

The distance of a galaxy from the earth is $5.6\times {10}^{25} \mathrm{m}$. Assuming the speed of light to be $3\times {10}^8 \mathrm{m} {\mathrm{s}}^{-1}$, find the time taken by light to travel this distance.

The wavelength of light is $589 \mathrm{nm}$. What is its wavelength in $\stackrel{0}{\mathrm{A}}$?

It takes eight minutes for light to reach from the Sun to the Earth surface. If the speed of the light is taken to be $3\times {10}^8 \mathrm{m} {\mathrm{s}}^{-1}$, find the distance from the Sun to the Earth in $\mathrm{km}$.

The distance of a star from the Earth is $8.33 \mathrm{light} \mathrm{minutes}$. What do you mean by this statement? Express the distance in $\mathrm{metre}$.

The mass of an oxygen atom is $16.00 \mathrm{u}$. Find its mass in $\mathrm{kg}$.