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प्रश्न
Why is the metre length in terms of the wavelength of light considered more accurate?
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
When is a vernier Callipers said to be free from zero error?
Name the part of the vernier callipers which is used to measure the following
Thickness of a pencil.
A vernier callipers has its main scale graduated in mm and 10 divisions on its vernier scale are equal in length to 9 mm. When the two jaws are in contact, the zero of the vernier scale is ahead of the zero of the main scale and the 3rd division of the vernier
scale coincides with a main scale division.
Find : (i) The least count and
(ii) The zero error of the vernier callipers.
A micrometre screw gauge has a positive zero error of 7 divisions, such that its main scale is marked in 1/2 mm and the circular scale has 100 divisions. The spindle of the screw advances by 1 division complete rotation.
If this screw gauge reading is 9 divisions on the main scale and 67 divisions on the circular scale for the diameter of a thin wire, calculate
- Pitch
- L.C.
- Observed diameter
- Corrected diameter
For what range of measurement is micrometre screw gauge used?
Find the volume of a book of length 25 cm, breadth 18 cm and height 2 cm in m3.
Explain the term least count of a screw gauge. How are they determined?
State whether the following statement is true or false by writing T/F against it.
The metre scale, vernier calipers, and screw gauge are in decreasing order of least count.
