Explanation
We know area of triangle is A = l b = 10.5 × 2.1=22.05 cm2
Minimum possible measurement of scale = 0.1 cm
Product should have significant figures that are present in a measurement with least number of significant figure.
Area Measured by scale = 22 cm2
F = ma = kgms-2
SI unit of force is Newton(W)
Hence, newton is a derived unit
Wien’s law states that the product of wavelength corresponding to maximum intensity of radiation and temperature of body (in Kelvin) is constant.
λmT = b
b = wein’s constant
b = 2.89×10-3 m-K
Charge = current × time = (ampere)(hour)
Potential = work done per unit charge
V = W/q
Therefore, dimension of potential is same as that of work per unit charge.
Change in momemtum is called impulse. So impulse and momentum have same dimension.
Vernier scale with 1 MSD = 1 mm and 9 MSD = 10 VSD
Least count = 1MSD – 1VSD = 1 mm – 9/10 mm = 0.1 mm.
Now, 3.50 cm = 35 mm
A meter scale gives measurement 35 mm then 36 mm. It does not give more precision. So, 35 mm can be measured by vernier calliper .
c) Screw gauge will give 35 mm to 35.09 mm.
d) Screw gauge will give 35.00 or 35.02 or 35.98 mm.
If any number has more than one digit after decimal place are significant. Power of 10 does not affect number of significant figures.
4.8000 × 104 = 5 significant figure (4,8,0,0,0)
48000.50 = 7 significant figure (4,8,0,0,0,5 0)
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