Advertisements
Advertisements
प्रश्न
How many stamps are needed to cover the rectangle?
Advertisements
उत्तर
The number of stamps that can be placed in the rectangle
= 7 × 4
= 28
APPEARS IN
संबंधित प्रश्न
The principle of ‘parallax’ in section 2.3.1 is used in the determination of distances of very distant stars. The baseline AB is the line joining the Earth’s two locations six months apart in its orbit around the Sun. That is, the baseline is about the diameter of the Earth’s orbit ≈ 3 × 1011m. However, even the nearest stars are so distant that with such a long baseline, they show parallax only of the order of 1” (second) of arc or so. A parsec is a convenient unit of length on the astronomical scale. It is the distance of an object that will show a parallax of 1” (second) of arc from opposite ends of a baseline equal to the distance from the Earth to the Sun. How much is a parsec in terms of meters?
Exercise
500 gm = ______ kilogram.
Ten millimetre makes one centimetre.
What is Dinesh’s height in metres? _____ m _____ cm.
Measure the yellow rectangle. It is ________ cm long.
How close was your earlier guess? Discuss.
Length is a fundamental quantity.
What is the unit of measurements of very small lengths?
What is the unit of length?
SI unit of electric current is ______.
Mars has approximately half of the earth’s diameter. When it is closest to the earth it is at about 1/2 A.U. from the earth. Calculate what size it will appear when seen through the same telescope.
According to the modern definition, what fraction of a second does light travel to define one metre?
In the parallax formula D = b/θ, what must be true about the angle θ for the calculation to be correct?
What is an Astronomical Unit (AU)?
What is the SI unit of length?
Which instruments are used to measure very small distances at the atomic scale?
