Advertisements
Advertisements
प्रश्न
'The distance of a star from the earth is 8.33 light minutes.' what do you mean by this statement? Express the distance in metre.
उत्तर
'The distance of a star from the earth is 8.33 light minutes' implies, it takes 8.33 minutes for light to reach the earth from the star.
As we know,
Distance = speed × time
Given,
Speed = 3 × 108ms-1
Time = 8.33 min
= 8.33 × 60s
= 499.8s
≈ 500s
Substituting the values in the formula above we get,
Distance = 3 × 108 × 500
= 1500 × 108
= 1.5 × 1011
Therefore, the distance from the star to the earth is 1.5 × 1011 m.
APPEARS IN
संबंधित प्रश्न
What do you understand by the term order of magnitude of a quantity?
State the factors which determine the number of significant figures for the calculation of the final result of an experiment.
What do you mean by the term unit?
Name three units of length which are bigger than a meter. How are they related to the meter?
One cubic metre is equal to ______ cubic centimetre.
Define measurement.
______ is the process of finding an unknown physical quantity by using a standard quantity.
Write one example of the following type of motion.
Rectilinear
Define measurement.
