A beam of light from a monochromatic laser shines into a piece of glass. The glass has thickness l and index of refraction n=1. 5. The wavelength of the laser light in vacuum is l/10 and its frequency is f. In this problem, neither the constant c nor its numerical value should appear in any of your answers.

Afood web shows who eats who in any given habitat. every living thing, from one-celled algae to giant blue whales, needs food to survive. each food web is a possible pathway that energy and matter can follow through the habitat. a food web begins with producers: organisms that convert sunlight into usable chemical energy. the food web is completed by the decomposers who turn organic wastes, such as decaying plants, into inorganic materials, such as nutrient-rich soil. decomposers complete the cycle of life, returning nutrients to the soil or oceans for use by producers. in this food web, identify the decomposer.

After rain, water soaks into the ground and is added to the groundwater. this process is known as a. groundwater pollution. b. groundwater recharge. c. groundwater recycling. d. groundwater filtration.

Give an example of the type and scale of economic activity for a traditional economy.