Which Of The Following Coloured Light Has The Lowest Frequency?

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Question

1. Green
2. Blue
3. Red
4. Violet

Answer (Detailed Solution Below)

Detailed Solution

CONCEPT:

• Electromagnetic waves: The wave which is generated due to vibration between electric field and magnetic field and it does not need any medium to travel is called an electromagnetic wave. It can travel through a vacuum.

  • Light is a form of energy which is an example of an electromagnetic wave.

  • Wavelength: The distance between two successive crests or troughs is called wavelength of the wave.

  • Frequency: The number of vibration per unit time is called frequency.

Speed of wave (v) = frequency (f) × wavelength (λ)

• White light consists of seven constituent colours: Violet (V), Indigo (I), Blue (B), Green (G), Yellow (Y), Orange (O), Red (R).

• The frequency of the color light in the order from highest to lowest is given as acronym VIBGYOR (V > I > B > G > Y > O > R).

• From the above discussion, the violet has the highest frequency and the shortest wavelength of the visible colors of light.
• The red color light has the lowest frequency and the longest wavelength of the visible colors of light. So option 3 is correct.

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