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You Are a Salesperson in a Major Department Store

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You are a salesperson in a major department store.Though you might not actually believe it,you follow the policy of "the customer is always right" in your daily work at the store.However,since you do not agree with that view,you often experience


Definitions:

Ultraviolet Light

A type of electromagnetic radiation with a wavelength shorter than that of visible light but longer than X-rays.

Absolute Threshold

The minimum intensity of a stimulus that one can detect 50% of the time.

Brightness

Lightness or luminance; the dimension of visual experience related to the amount (intensity) of light emitted from or reflected by an object.

Dark Room

A room used in photography processing where photographic materials are handled in complete darkness or under a safelight.

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