Light Having a Speed in Vacuum of 3

question 50

Multiple Choice

Light having a speed in vacuum of 3.0 × 10⁸ m/s enters a liquid of refractive index 2.0.In this liquid,its speed will be

• A)6.0 × 10⁸ m/s.
• B)3.0 × 10⁸ m/s.
• C)1.5 × 10⁸ m/s.
• D)0.75 × 10⁸ m/s.
• E)0.67 × 10⁸ m/s.

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Definitions:

Existential Instantiation

A logical principle allowing for the inference of the existence of an instance of a predicate from a statement asserting the existence of some (possibly unspecified) instance.

Universal Instantiation

A logical rule stating that if something is true for everything in a certain category, it is true for each specific member of that category.

Existential Generalization

A logical inference rule that allows for the conclusion that something exists based on the existence of a particular instance.

Quantifier Negation

The act of negating the quantifier in a logical statement, which changes the scope or range of the statement.