Bennett Mechanical Test Acoustics and Optics 4

Question 1

A sonar device measures distance by timing how long it takes sound to:

Accepted Answer

Travel to an object and return

Answer

Sonar measures the round-trip travel time of a sound pulse to calculate distance.

Question 2

When you see lightning before hearing thunder, it is because:

Accepted Answer

Light travels faster than sound

Answer

Light reaches you almost instantly while sound travels much more slowly, so it arrives later.

Question 3

A smooth, shiny surface reflects light in a way called:

Accepted Answer

Regular (specular) reflection

Answer

Smooth surfaces reflect parallel rays uniformly, producing clear specular reflections.

Question 4

A magnifying glass forms a larger image because it is a:

Accepted Answer

Convex lens

Answer

A convex lens converges light and produces an enlarged, upright virtual image up close.

Question 5

The number of complete sound waves passing a point each second is the wave's:

Accepted Answer

Frequency

Answer

Frequency counts the waves per second, measured in hertz.

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