Advertisements
Advertisements
Question
How many astronomical units (A.U.) make 1 parsec?
Solution
1 A.U. long arc subtends the angle of 1 s or 1 arc sec at distance of 1 parsec.
Thus, angle 1 sec = `(1 A.U.)/1` parsec
Thus, 1 parsec = `(1 A.U.)/1` arc sec
Thus, 1 parsec = `(630(3600))/11`
= 206182.8
= 2 × 105 A.U.
APPEARS IN
RELATED QUESTIONS
Match the following.
| 1. | Length | kelvin |
| 2. | Mass | metre |
| 3. | Time | kilogram |
| 4. | Temperature | second |
Which line is longer? C or D? Measure each line. How good is your guess?
How many stamps can be placed along its length?
How wide is the rectangle? ________ cm
Arbaz plans to tile his kitchen floor with green square tiles. Each side of the tile is 10 cm. His kitchen is 220 cm in length and 180 cm wide. How many tiles will he need?
There are two beautiful lakes near a village. People come for boating and picnics in both the lakes. The village Panchayat is worried that with the noise of the boats the birds will stop coming. The Panchayat wants motorboats in only one lake. The other lake will be saved for the birds to make their nests.
- How many cm is the length of the boundary of lake A in the drawing?(use thread to find out)
There are two beautiful lakes near a village. People come for boating and picnics in both the lakes. The village Panchayat is worried that with the noise of the boats the birds will stop coming. The Panchayat wants motorboats in only one lake. The other lake will be saved for the birds to make their nests.
- Find the area of lake B on the drawing in square cm. What is its actual area in square km?
What formula is used to measure the area of your classroom?
The SI unit of mass is kg.
The radius of atom is of the order of 1 Å and the radius of nucleus is of the order of fermi. How many magnitudes higher is the volume of atom as compared to the volume of nucleus?
