Measurements of Length, Mass and Time
1. What is triangulation method of measuring distances?
Solution: This method is used to measure distances based on geometrical properties of a triangle.
2. What is the principle of measuring very large distance?
Solution: In order to measure very large distances such as the distance of moon from earth or the distance of sun from earth, we make angular measurements.
Measurement of Length, Mass & Time
3. What is the working principle of RADAR?
Solution: The RADAR is based on the reflection of radio waves from an aero-plane or distant astronomical object. Note that RADAR stands for Radio Detection and Ranging.
4. What is the difference between the inertial mass and gravitational mass.
Solution: We can define the mass of a body in two ways. One method is to define mass as a measure of inertia of the body. This is called inertial mass. The second method is to define mass as a measure of gravitational force. This is gravitational mass. It is experimentally established that two are equal.
5. How many atoms are there in 108 grams of silver?
Solution: 6.032 x 1023 atoms (Avogadro’s number) in 108 g of silver.
