Give short answer III — task. Science State Board, Class 7.

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1. Define the density of objects.

Density is defined as the of the substance contained in a unit .

The formula for density (

$D$ ) is given as

The SI unit of density is and the CGS unit is

$g/ cm^3$ .

2. What is one light year?

The covered by the light travelling at a speed of

$\times{10^8}$

$m$ in for a year gives one light year.

The value of one light-year can be calculated by of light and the total by the light in one year.

Did you find an error?

19. Give short answer III