Question

The brightness producing capacity of a source
(1). Does not depend on its power
(2). Does not depend on the wavelength emitted
(3). Depends on its power
(4). Depends on the wavelength emitted

Answer 1

Hint: The images that we see depend on the perception power of our eyes. Also the light from different sources may vary in accordance with the source used.

Complete step by step answer:
-The property of human eyes is that it could perceive yellow color the most. The brightness that the eyes visualize depends on how the eyes perceive the light. So the brightness depends on the color of the source.
-Also we know that the color of the light is directly related with the wavelength of the source. For the light of colours like yellow to get emitted, the source must emit high wavelength light rays. So the source with high wavelengths produces bright light rays.
-We are aware that light waves have both particle and wave nature. This is called wave particle duality. In this concept, light rays are supposed to travel in quanta of photons. These photons are received by the retina of our eyes. The more the number of photons reaching, the more brightness will be produced. These photons are characteristics of sources that emit the light. A powerful source will produce a ray with more number of photons. And hence the brightness depends on the power of the source.
Therefore, the correct option from the given ones are the options (3) and (4).

Note:We should remember that the wavelength of the light emitted from a source is dependent on the material being used in the source. The wavelength is inversely related with the frequency.