Acoustics and Optics Flashcards
7 cards from real Bennett Mechanical Test practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.
Read the first 7 Acoustics and Optics flashcards as text
A sonar device measures distance by timing how long it takes sound to:
Answer: Travel to an object and return
Sonar measures the round-trip travel time of a sound pulse to calculate distance.
When you see lightning before hearing thunder, it is because:
Answer: Light travels faster than sound
Light reaches you almost instantly while sound travels much more slowly, so it arrives later.
A smooth, shiny surface reflects light in a way called:
Answer: Regular (specular) reflection
Smooth surfaces reflect parallel rays uniformly, producing clear specular reflections.
A magnifying glass forms a larger image because it is a:
Answer: Convex lens
A convex lens converges light and produces an enlarged, upright virtual image up close.
The number of complete sound waves passing a point each second is the wave's:
Answer: Frequency
Frequency counts the waves per second, measured in hertz.
An object appears red because it:
Answer: Reflects red light and absorbs others
A red object reflects red wavelengths to your eyes while absorbing the other colors.
Sound waves are classified as which type of wave?
Answer: Longitudinal
Sound is a longitudinal wave where particles vibrate parallel to the direction of travel.