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प्रश्न
Define metre in terms of the wavelength of light.
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उत्तर
One metre is defined as 1,650,763.73 times the wavelength of a specified orange-red spectral line in emission spectrum of Krypton = 86.
OR
One metre is defined as 1,553,164.1 times the wavelength of the red line in the emission spectrum of cadmium.
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संबंधित प्रश्न
The wavelength of light is 589 nm. what is its wavelength in Å?
Name the part of the vernier callipers which is used to measure the following
Internal diameter of a mug
Explain the terms : Pitch .
How are they determined?
In the vernier callipers, there are 10 divisions on the vernier scale and 1 cm on the main scale is divided into 10 parts. While measuring the length, the zero of the vernier lies just ahead of the 1.8 cm mark and the 4th division of vernier coincides with a main scale division.
(a) Find the length.
(b) If zero error of vernier callipers is -0.02 cm,
What is the correct length ?
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
In figure for vernier callipers, calculate the length recorded.
Who invented vernier callipers?
What do you understand by the term least count of screw?
