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Q: What is the velocity of light in vacuum?
  • A. 3 x 10⁸ ms⁻¹
  • B. 2 x 10⁸ ms⁻¹
  • C. 3 x 10⁷ ms⁻¹
  • D. 3 x 10⁶ ms⁻¹
Correct Answer: Option A - Light is a type of energy that is transmitted in the form of an electromagnetic wave. It has a wavelength between 3900Å to 7800Å. The speed of light varies in different mediums. The speed of light in air and vacuum is 3×10⁸ m / s while in water 2.25 × 10⁸m / s in glasses is 2 × 10⁸ m / s.
A. Light is a type of energy that is transmitted in the form of an electromagnetic wave. It has a wavelength between 3900Å to 7800Å. The speed of light varies in different mediums. The speed of light in air and vacuum is 3×10⁸ m / s while in water 2.25 × 10⁸m / s in glasses is 2 × 10⁸ m / s.

Explanations:

Light is a type of energy that is transmitted in the form of an electromagnetic wave. It has a wavelength between 3900Å to 7800Å. The speed of light varies in different mediums. The speed of light in air and vacuum is 3×10⁸ m / s while in water 2.25 × 10⁸m / s in glasses is 2 × 10⁸ m / s.