Waves from a Radio Station with a Wavelength of 761

question 79

Multiple Choice

Waves from a radio station with a wavelength of 761 m arrive at a home receiver a distance 50 km away from the transmitter by two paths.One is 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) 190 m
• B) 381 m
• C) 571 m
• D) 761 m
• E) ​1522 m

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Definitions:

Zygomatic Arch

The bone that forms the prominence of the cheek; it is part of the zygomatic bone and connects with the temporal bone of the skull.

Zygomatic Bone

A bone that forms the prominence of the cheek and part of the orbit of the eye.

Hyoid Bone

A U-shaped bone in the neck that supports the tongue and provides attachment for muscles of the neck and lower jaw.

Larynx

The voice box located in the neck, responsible for sound production and protecting the trachea against food aspiration.