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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
Explain the terms : Pitch .
How are they determined?
The final result of the calculation in an experiment is 125,347,200. Express the number in term of significant place when accuracy is between 1 and 1000
In figure for vernier callipers, calculate the length recorded.
Define the term least count as applied to a vernier callipers.
A micrometre screw gauge has a negative zero error of 8 divisions. While measuring the diameter of a wire the reading on the main scale is 3 divisions and the 24th circular scale division coincides with baseline.
If the number of divisions on the main scale are 20 to a centimetre and circular scale has 50 divisions, calculate
- pitch
- observed diameter.
- least count
- corrected diameter.
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.
Define the least count of an instrument.
How will you find the Zero Error of Vernier Caliper? Explain.
On a vernier calliper, 25 vernier scale divisions are equal in length to 24 main scale divisions. One main scale division is 1 mm. Find the least count of the instrument.
