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Q4.24(e):
Read each statement below carefully and state, with reasons and examples, if it is true or false : A scalar quantity is one that (e) has the same value for observers with different orientations of axes.

Solution :

Step 1: Theoretical Definition of a Scalar Quantity

A physical quantity is defined as a scalar if it is invariant under a transformation of the coordinate system. Mathematically, if $S$ is a scalar quantity in a coordinate system $K$ with axes $(x, y, z)$, and $S'$ is the same quantity in a coordinate system $K'$ with axes $(x', y', z')$ obtained by rotating the axes, then $S = S'$ must hold true [Per the definition of rotational invariance].

Step 2: Analysis of Coordinate Orientation

The orientation of axes refers to the rotation of the basis vectors $\mathbf{\hat{i}}, \mathbf{\hat{j}}, \mathbf{\hat{k}}$ to new basis vectors $\mathbf{\hat{i}'}, \mathbf{\hat{j}'}, \mathbf{\hat{k}'}$ through an orthogonal transformation matrix $R$, where $R^T R = I$.

For a scalar quantity $S$, its magnitude is independent of the spatial direction of the observer's chosen coordinate frame. Unlike vectors, which transform according to $\mathbf{A}' = R\mathbf{A}$, a scalar remains a constant value regardless of the orientation of the observer.

Step 3: Verification with Physical Examples

Consider the following examples to validate the statement:

Quantity Reasoning
Mass ($m$) The mass of a particle is an intrinsic property. Rotating the $x, y, z$ axes does not change the amount of matter in the body.
Temperature ($T$) Temperature is a thermodynamic state function. An observer looking at a thermometer from any orientation will measure the same scalar value.
Speed ($v$) While velocity ($\mathbf{v}$) is a vector that changes components under rotation, the speed ($v = |\mathbf{v}| = \sqrt{v_x^2 + v_y^2 + v_z^2}$) is invariant [By the property of Orthogonal Transformation].

Step 4: Geometric Illustration of Scalar Invariance

x y x' Point P (Scalar Value S) S = S' regardless of axis rotation

Step 5: Conclusion on Validity

The statement is True. Because scalar quantities represent physical magnitudes that do not possess directional components, they do not transform when the observer rotates their coordinate system. The scalar product (dot product) of two vectors, $\mathbf{A} \cdot \mathbf{B} = |\mathbf{A}||\mathbf{B}|\cos\theta$, is a primary example of a scalar that remains constant because both the magnitudes and the angle $\theta$ between vectors are invariant under coordinate rotation.

Final Solution: The statement is True; a scalar quantity is invariant under any rotation of the coordinate axes because it possesses magnitude only, lacking the directional dependence that necessitates vector transformation.


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