
Concept explainers
Which of the following forms of energy is the stimulus for vision? (a) chemical, (b) electrical, (c) mechanical, (d) radiant.

To determine:
The stimulus for vision from following forms of energy:
Chemical
Electrical
Mechanical
Radiant
Answer to Problem 1MC
Solution:
(d) Radiant: Vision is found operable only in the presence of light and light is classified as a form of radiant energy. The radiant energy can be defined as the energy of the gravitational radiation and electromagnetic radiation.
Explanation of Solution
Explanation for correct answer:
The radiant energy is usually used in the lighting, heating, solar energy, and radiometry. The radiant energy travels in the form of waves. The lengths of these waves are different and the spectrum of these waves is known as the electromagnetic spectrum. The radiant energy includes infrared waves, ultraviolet waves, X-rays, visible light, and radio waves. The light energy stimulates the eyes and plays a significant role in vision. Thus option (d) is the correct option.
Explanation for incorrect answer:
Option (a) is given as chemical energy is the stimulus for vision. This is an incorrect option as chemical energy that is released during a chemical reaction, is used to produce other form of energy like heat or mechanical energy. For example: Chemical energy of food is burn to produce mechanical energy or heat.
Option (b) is given as electrical energy is the stimulus for the vision. This is an incorrect option as electrical energy results from the flow of electric charge and mainly regulates the nervous system of an organism.
Option (c) is given as mechanical energy is the stimulus for vision. This is an incorrect option as mechanical energy is involved in movement processes such as lifting heavy object or running. Here, muscle contraction transforms the chemical energy into mechanical energy.
Thus it is concluded that radiant energy that includes infrared waves, ultraviolet waves, X-rays, visible light, and radio waves, plays a vital role as stimulus for the vision.
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