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
Sound travels fastest through which medium?
Answer: Steel
Sound moves fastest through dense solids like steel because tightly packed molecules transmit vibrations quickly.
When light passes from air into water, it bends because the light:
Answer: Slows down
Light slows when entering denser water, and this speed change bends (refracts) the ray.
An echo is produced when sound waves:
Answer: Reflect off a surface
An echo is sound reflecting off a hard surface and returning to the listener.
A higher-frequency sound wave is heard as a sound with a:
Answer: Higher pitch
Frequency determines pitch, so higher frequency means a higher pitch.
A convex (converging) lens is commonly used to:
Answer: Magnify objects
A convex lens converges light to a focal point and can magnify objects.
Which property of a sound wave determines its loudness?
Answer: Amplitude
Greater amplitude carries more energy and is heard as a louder sound.
A flat mirror produces an image that is:
Answer: Reversed left-to-right
A flat (plane) mirror produces an upright, same-size image that is laterally reversed.