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DOH Sonography (DOH-SONO) Practice Tests & Test Prep by Exam Edge - Review


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DOH Sonography - Reviews


   Excellent
Based on 100 reviews

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See why our users from 154 countries love us for their exam prep! Including 100 reviews for the DOH Sonography exam.

Exam Edge is an industry leader in online test prep. We work with institutional partners to offer a wide array of practice tests that will help you prepare for your big exam. No matter how niche your field of interest might be, we're here to help you prepare for test day.

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DOH Sonography - Test Reviews Sample Questions

What is the angle between the propagation direction and a line that is 90° to the interface?

Correct Answer:
angle of incidence.


the question inquires about the angle formed between the propagation direction of a wave (such as light or sound) and a line that is perpendicular to the interface where the wave encounters a change in medium. this specific angle is known as the angle of incidence.

to clarify, the interface refers to the boundary between two different media through which the wave is traveling. for example, in the case of light, this could be the surface between air and water. the line mentioned in the question, which is perpendicular to the interface, is often referred to as the normal line or simply the normal.

the angle of incidence is then defined as the angle between the wave's propagation direction (its path before it hits the interface) and this normal. it is a crucial parameter in understanding how waves behave when they meet a boundary between two different media.

according to the laws of reflection and refraction, the angle of incidence is equal to the angle of reflection, which is the angle between the normal and the direction in which the wave moves after bouncing off the interface. in scenarios involving refraction, where the wave bends upon passing through the interface, the relationship between the angle of incidence and the angle of refraction is described by snell's law.

therefore, when discussing the propagation of a wave relative to an interface, the angle of incidence not only determines the behavior of the wave at the boundary but also serves as a fundamental concept in the study of optical and acoustic phenomena.

What type of resolution can be enhanced by adding color?

Correct Answer:
contrast resolution.


the correct type of resolution that can be enhanced by adding color is contrast resolution. contrast resolution refers to the ability of an imaging system to distinguish between differences in intensity in an image.

when color is added to an image, it enhances the visual differentiation between various features within that image. the human eye can perceive a wide range of colors, which helps in distinguishing objects or areas that might be close in intensity but different in color. this is particularly useful in fields like medical imaging, satellite imagery, and digital photography, where distinguishing subtle differences can be crucial.

in grayscale images, details are represented by variations in brightness only. however, when colors are introduced, they add a new dimension of information. colors can represent different depths, densities, or types of tissue, among other characteristics. this additional information can help in identifying features in an image more accurately and quickly.

for example, in medical imaging, different colors can be used to highlight different types of tissues or fluid accumulations, which can be critical for accurate diagnosis. in satellite images, color can help in differentiating between various land covers, such as water bodies, forests, and urban areas.

therefore, contrast resolution is significantly enhanced by the addition of color, as it increases the ability of the imaging system to highlight and distinguish different parts of the image based on color differentiation. this enhancement helps in improving the accuracy and efficiency of image analysis across various applications.