Ultraviolet radiation is harmless to humans True False Infrared waves are not se
ID: 3308279 • Letter: U
Question
Ultraviolet radiation is harmless to humans
True
False
Infrared waves are not seen by the naked human eyes.
True
False
Diffraction phenomena only involve light rays.
True
False
The Light brightness is related with:
Certain angles of the light rays
Higher light intensities
Higher light frequencies
None of the above
During a total solar eclipse the Sun becomes black at certain spots on the Earth where the Moon shadow is found.
True
False
Light corresponds to a very wide range of frequencies in the Spectrum.
True
False
The Retina is at the back of the eye and represents the detector of light rays.
True
False
During the Superposition of two waves that are exactly one-half wavelength out of phase the waves should:
continue without changes
cancel each other
reinforce each other
None of the above
Blind Spots are three or four places of the Retina unable to detect light rays.
True
False
Different light colors correspond to:
Different wave velocities
Different wave amplitudes
Different frequencies
None of the above
Certain angles of the light rays
Higher light intensities
Higher light frequencies
None of the above
Explanation / Answer
a) True. Ultraviolet radiation is harmless to humans. UV can produce cancer cells.
b) Ture. Infrared waves cannot be seen by the naked human eyes. Like we cannot see the light coming out from hot iron rod.
c) False. Diffraction phenomena is involved with all types of waves. It is also observed in sound waves.
d) The correct option is Higher light intensities.
The more intense light will provide more brightness.
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