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.
Advertisements
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 × 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
संबंधित प्रश्न
Name the physical quantities which are measured in the given units:
nm
A boy makes a ruler with graduations in cm on it, (i.e. 100 divisions in 1 m). To what accuracy this ruler can measure? How can this accuracy be increased?
State or define the following term:
An hour
Complete the rollowing:
1 m = ____ μ.
Arrange the following in correct sequence.
1L, 100 cc, 10 L, 10 cc
Cross word puzzle.
Clues – Across
- SI unit of temperature;
- A derived quantity;
- Mass per unit volume;
- Maximum volume of liquid a container can hold
Clues – Down
- A derived quantity
- SI unit of volume
- A liquid denser than iron
- A unit of length used to measure very long distances
Hold a sheet paper in one hand and a book in one hand. Which hand feels heavy? Why?
When 5 coulomb of charge, flows through a circuit for 20 seconds. Calculate the current?
Define measurement.
