मराठी
महाराष्ट्र राज्य शिक्षण मंडळएचएससी विज्ञान (सामान्य) इयत्ता ११ वी

Answer the following question. Star A is farther than star B. Which star will have a large parallax angle? - Physics

Advertisements
Advertisements

प्रश्न

Answer the following question.

Star A is farther than star B. Which star will have a large parallax angle?

टीपा लिहा
Advertisements

उत्तर

  1. 'b' is constant for the two stars
    ∴ θ ∝ `1/"D"`
  2. As star A is farther i.e., DA > DB
    ⇒ θA < θ
    Hence, star B will have a larger parallax angle than star A.
shaalaa.com
  या प्रश्नात किंवा उत्तरात काही त्रुटी आहे का?
पाठ 1: Units and Measurements - Exercises [पृष्ठ १४]

APPEARS IN

बालभारती Physics [English] Standard 11 Maharashtra State Board
पाठ 1 Units and Measurements
Exercises | Q 2. (i) | पृष्ठ १४

संबंधित प्रश्‍न

The farthest objects in our Universe discovered by modern astronomers are so distant that light emitted by them takes billions of years to reach the Earth. These objects (known as quasars) have many puzzling features, which have not yet been satisfactorily explained. What is the distance in km of a quasar from which light takes 3.0 billion years to reach us?


The nearest star to our solar system is 4.29 light years away. How much is this distance in terms of parsecs? How much parallax would this star (named Alpha Centauri) show when viewed from two locations of the Earth six months apart in its orbit around the Sun?


Just as precise measurements are necessary in science, it is equally important to be able to make rough estimates of quantities using rudimentary ideas and common observations. Think of ways by which you can estimate the following (where an estimate is difficult to obtain, try to get an upper bound on the quantity):

 

the number of strands of hair on your head


Just as precise measurements are necessary in science, it is equally important to be able to make rough estimates of quantities using rudimentary ideas and common observations. Think of ways by which you can estimate the following (where an estimate is difficult to obtain, try to get an upper bound on the quantity):-

the number of air molecules in your classroom.


While measuring the length of an object using a ruler, the position of your eye should be


500 gm = ______ kilogram.


Length of one’s chest can be measured using metre scale.


Complete the analogy.

Height of a person: cm :: Length of your sharpened pencil lead:______?


Fill in the following chart.

Property Definition Basic Unit Instrument used for measuring
Length      
Mass      
Volume      
Time      

Find the answer for the following questions within the grid.

  1. 10-3 is one ______
  2. SI Unit of time is ______
  3. Cross view of reading a measurement leads to ______
  4. ______ is the one what a clock reads.
  5. ______ is the amount of substance present in an object.
  6. ______ can be taken to get the final reading of the recordings of different students for a single measurement.
  7. ______ is a fundamental quantity.
  8. ______ shows the distance covered by an automobile
  9. A tailor uses ______ to take measurements to stitch the cloth.
  10. Liquids are measured with this physical quantity.

Rulers, measuring tapes and metre scales are used to measure ______


Match the following.

1. Length kelvin
2. Mass metre
3. Time kilogram
4. Temperature second

Have you seen frogs? Where? How many different types of frogs have you seen? Are all the frogs of the same length? Here are two interesting examples.


Difference in size
Do this for yourself and find the difference.


How wide is the rectangle? ________ cm


How close was your earlier guess? Discuss.


Can you think of how to cut a postcard so that you can pass through it?


You can play this game on the ground. Make two squares of one square meter each. Divide your class into two teams. Ready to play!

  • How many of you can stand in it?

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 kilometers long is the actual boundary of lake B?

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.

  • A longer boundary around the lake will help more birds to lay their eggs. So which lake should be kept for birds? Which lake should be used for boats?

What is the unit of length?


Length is ______.


The Unit used to measure length ______.


SI unit of electric current is ______.


Larger unit for measuring time is ______.


Yard was used as the unit of length.


In an experiment to estimate the size of a molecule of oleic acid 1 mL of oleic acid is dissolved in 19 mL of alcohol. Then 1 mL of this solution is diluted to 20 mL by adding alcohol. Now 1 drop of this diluted solution is placed on water in a shallow trough. The solution spreads over the surface of water forming one molecule thick layer. Now, lycopodium powder is sprinkled evenly over the film and its diameter is measured. Knowing the volume of the drop and area of the film we can calculate the thickness of the film which will give us the size of oleic acid molecule.

Read the passage carefully and answer the following questions:

  1. Why do we dissolve oleic acid in alcohol?
  2. What is the role of lycopodium powder?
  3. What would be the volume of oleic acid in each mL of solution prepared?
  4. How will you calculate the volume of n drops of this solution of oleic acid?
  5. What will be the volume of oleic acid in one drop of this solution?

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.


What is an Astronomical Unit (AU)?


Share
Notifications

Englishहिंदीमराठी


      Forgot password?
Use app×