The least count of a stopwatch is 0.2 sec. The time period of 20 oscillations of a pendulum is measured to be 25.0 sec. What is the percentage error in this measurement?
The least count of stopwatch is = 0.2 s
Time period of 20 oscillations =
Percentage error in measurement =
= 0.8%
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What is the formula to find out the radius of curvature of a spherical surface?
Radius of curvature of a spherical surface is given by,
where,
l is average distance between the three fixed legs of spherometer, and
h is the height of the central screw above the plane surface.