Which of the following is not a unit of length?
Correct answer: B. radian
- A. light year
- B. radian
- C. angstrom
- D. micron
Explanation
A light year, angstrom and micron are units of length: approximately 9.46 × 10^15 m, 10^-10 m and 10^-6 m respectively. A radian measures plane angle, not length. Students often choose angstrom because it is less familiar, but it is a valid length unit.
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About Angular Displacement
Angular displacement measures the change in a body’s angular position and is expressed in radians or degrees, with anticlockwise and clockwise directions assigned signs. It connects to arc length, angular velocity and angular acceleration, and must be distinguished from ordinary linear displacement in rotational motion.
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