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Assertion: the volume element in spherical coordinates carries a factor \( r^2 \sin\theta \). Reason: the coordinate surfaces of the system are not planes.

  • A.the assertion is true but the reason given for it is false
  • B.the assertion is false although the reason offered is a true statement in itself
  • C.both the assertion and the reason are true and the reason explains the assertion
  • D.both the assertion and the reason are true but the reason does not explain the assertion

Answer: C

The angular coordinates are not lengths, so each must be multiplied by the radius of the circle it sweeps to become one. That is a direct consequence of the curvilinear geometry, which the reason states in general terms.

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