Waves from a Radio Station with a Wavelength of 900

question 57

Multiple Choice

Waves from a radio station with a wavelength of 900 m arrive at a home receiver a distance 50 km away from the transmitter by two paths.One arrives via a direct-line path and the second by reflection from a mountain directly behind the receiver.What is the minimum distance between the mountain and receiver such that destructive interference occurs at the location of the listener? Assume no phase change on reflection.

• A) 675 m
• B) 900 m
• C) 450 m
• D) 225 m

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Definitions:

Inputs

Factors including workforce, materials, and funds employed in the process of creating products or offering services.

Production

The process of combining various material inputs and immaterial inputs (plans, know-how) to make something for consumption.

Constant Returns To Scale

A situation in production where increasing the amount of inputs results in a proportionate increase in the output.

Poorer Grows Faster

An observation in economics that poorer economies tend to grow at a faster rate than richer economies due to the catch-up effect.