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प्रश्न
Why is the metre length in terms of the wavelength of light considered more accurate?
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उत्तर
Metre length in terms of the wavelength of light is considered more accurate because
- The wavelength of light does not change with time, temperature, pressure, etc.
- It can be reproduced anywhere at any time because Krypton is available everywhere.
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संबंधित प्रश्न
Name the part of the vernier callipers which is used to measure the following
Thickness of a pencil.
A screw gauge has 50 divisions on its circular scale and its screw moves by 1 mm on turning it by two revolutions. When the flat end of the screw is in contact with the stud, the zero of the circular scale lies below the base line and 4th division of the circular scale is in line with the base line. Find
(i) The pitch,
(ii) The least count and
(iii) The zero error of the screw gauge
State the formula for determining a pitch
State the formula for calculating the least count of screw.
A measuring cylinder is filled with water up to a level of 30 ml. A solid body is immersed in it so that the level of water rises to 37 ml. Now the solid body is tied with a cork and then immersed in water so that the water level rises to 40 ml. Find the volume of the solid body and the cork.
Name the measuring employed to measure the diameter of a needle.
Define the least count of an instrument.
