Concept explainers
BIO Amazing honeybees The survival of a bee colony depends on the ability of bee scouts to locate food and to convey that information to the hive. After finding a promising food source, a honeybee scout returns to the hive and uses a waggle dance to tell its worker sisters the direction and distance to the food.
Recall that light coming directly from the Sun is unpolarized Bees use the direction of the Sun as a reference for their travel In the hive, the scout bee's waggle dance is in the shape of a flat figure eight (Figure 25.28). The upward direction in the vertical hive represents the direction toward the Sun. The middle line of the scout’s figure eight points in the direction of the food relative to the direction of the Sun. Thus a
Incandescent lightbulbs—soon to disappear Australia, Canada, New Zealand, and the European Union started phasing out incandescent lightbulbs in 2009. The United States phased them out in 2014. These bulbs have provided light for the world for more than 90 years What’s the problem?
Incandescent lightbulbs produce light when electrons (
Banning incandescent bulbs will reduce energy usage According to the Department of Energy, about
What is the rate of visible light emission from a 100-W incandescent lightbulb?
a. 10 W
b. 20 W
c. 50 W
d. 100 W
e. Not enough information to make a determination
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