Who invented the photophone?
Correct answer: A. Graham Bell
- A. Graham Bell
- B. Galileo
- C. Torricelli
- D. Maxwell
Explanation
Reason: The photophone, an early device for transmitting sound on a beam of light, was invented by Alexander Graham Bell. The photophone used a beam of sunlight to carry sound vibrations from a source to a receiver. Bell's invention was based on the principle that when an object, such as a diaphragm, is exposed to sunlight, the variations in the light intensity caused by sound waves can be detected. This variation in light intensity was then converted back into sound at the receiving end.
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Light is studied through reflection, refraction, dispersion, interference, diffraction and polarization, linking ray behavior with its wave nature. Questions may involve mirrors, lenses, optical instruments, refractive index and image formation, while geometrical optics deals with rays and wave optics explains effects such as interference and diffraction.
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