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1. Question
Prosopagnosia
The failures of sensory perception can be unusual and debilitating. A particular sensory deficit that inhibits an important social function of humans is prosopagnosia, or face blindness. The word comes from the Greek words prosopa, that means “faces,” and agnosia, that means “not knowing.” Some people may feel that they cannot recognize people easily by their faces. However, a person with prosopagnosia cannot recognize the most recognizable people in their respective cultures. They would not recognize the face of a celebrity, an important historical figure, or even a family member like their mother. They may not even recognize their own face.
Q. Which of the following is NOT true about prosopagnosia?
a. Another name for prosopagnosia is face blindness
b. The word is derived from two Greek words that were combined
c. People with this sensory deficit can’t recognize celebrities or historical figures, but they normally recognize close family members
d. Some individuals suffering from face blindness might not be able to recognize themselves
2. Question
Light as a Photon
The electromagnetic wave model of light (as formulated by Maxwell) was one of the great triumphs of nineteenth-century science. In 1887, when Heinrich Hertz actually made invisible electromagnetic waves (what today are called radio waves) on one side of a room and detected them on the other side, it ushered in a new era that led to the modern age of telecommunications. His experiment ultimately led to the technologies of television, cell phones, and today’s wireless networks around the globe.
However, by the beginning of the twentieth century, more sophisticated experiments had revealed that light behaves in certain ways that cannot be explained by the wave model. Reluctantly, physicists had to accept that sometimes light behaves more like a “particle”—or at least a self-contained packet of energy—than a wave. We call such a packet of electromagnetic energy a photon.
The fact that light behaves like a wave in certain experiments and like a particle in others was a very surprising and unlikely idea. After all, our common sense says that waves and particles are opposite concepts. On one hand, a wave is a repeating disturbance that, by its very nature, is not in only one place, but spreads out. A particle, on the other hand, is something that can be in only one place at any given time. Strange as it sounds, though, countless experiments now confirm that electromagnetic radiation can sometimes behave like a wave and at other times like a particle.
Q. According to paragraph 3, which of the following is NOT true?
a. Certain experiments have demonstrated that light can act both like a wave and a particle
b. It’s logical that something can act as both a wave and particle because they are closely-related ideas
c. Particles are only capable of being in one place at a time
d. Electromagnetic radiation, as it has been shown in experiments, can act like a wave at times and like a particle at others