Physical World and Measurement

1 parsec = 3.08 x 10¹⁶ m Explanation

A parsec is an astronomical term for measuring distance in space. A single parsec is approximately 3 light years or 30 trillion kilometers. It is the distance […]

1 light year = 9.46 x 10¹⁵ m Explanation

Distance that light travels with velocity of 3 x 10⁸ m/s in 1 year. The distance light travels in the course of a year is called […]

1 Astronomical Unit = 1.496 x 10¹¹ m Explanation

Average distance of the Sun from the Earth

1 angstrom (A) = 10⁻¹⁰ m Explanation

Used to measure wavelengths of light. The visible-light spectrum extends from approximately 7700 angstroms (red light) to 3900 angstroms (violet light).

1 year = 365.25 days = 3.156 x 10⁷ secs Explanation

One Year is the time taken by the earth to make one revolution around the sun.