Advertisements
Advertisements
Question
‘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.
Advertisements
Solution
‘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 × 60 s
= 499.8 s
Substituting the values in the formula above, we get
Distance = 3 × 108 × 499.8 s
= 1.4994 × 108
= 1.4 × 1011
Therefore, the distance from the star to the earth is 1.4 × 1011 m.
APPEARS IN
RELATED QUESTIONS
What is a leap year?
A boy measures the length of a pencil and expresses it to be 2.6 cm. what is the accuracy of his measurement? Can he write it as 2.60 cm?
State two units of mass smaller than a kilogram?
Quantity that can be measured is called ____
1 m = ______ cm.
The distance between your school and your house is 2250 m. Express this distance in kilometre.
Hold a sheet paper in one hand and a book in one hand. Which hand feels heavy? Why?
A piece of ribbon folded five times is placed along a 30 cm long measuring scale as shown in the following figure.
The length of the ribbon is between
