2.6 Which of the following is the most precise device for measuring length?
(a) A vernier calipers with 20 divisions on the sliding scale
(b) A screw gauge of pitch 1 mm and 100 divisions on the circular scale
(c) An optical instrument that can measure length to within a wavelength of light ?
2.6 Which of the following is the most precise device for measuring length?
(a) A vernier calipers with 20 divisions on the sliding scale
(b) A screw gauge of pitch 1 mm and 100 divisions on the circular scale
(c) An optical instrument that can measure length to within a wavelength of light ?
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1 Answer
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2.6
(a) The least count of a vernier calliper = 0.1 mm
(b) The least count of the screw gauge = 1/100 mm = 0.01 mm
(c) The least count of the optical instrument = wave length of the light = 10-5cm = 10-3 mm = 0.001 mm
Hence the answer is (c)
Similar Questions for you
According to question, we can write
Total moles of gas = n = nOxygen + nOxygen =
Volume of gas = 12 × 22.4 litre = 268.8 litre = 2.688 × 105 cm3
Viscosity = Pascal . Second
=
= x = 1, x + 2y = -1, -x + z = 1
y = -1, Z = 0
Viscosity = [P1A-1T0]
1 msD = 1mm
10 vsD = 9msD
1vsD = 0.9 MsD
L.C. = 1MSD – 1VSD = 1 – 0.9 = 0.1 mm
Zero error = 4LC = 0.4 mm
Reading = MSR + VSR + correction
= 4.1 cm + 6 * .01 cm + (-0.04 cm) = (4.1 + 0.06 – 0.04) cm
= 4.12 cm = 412 * 10-2 cm
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