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
Why can't sound travel through outer space?
Answer: There is no medium to carry it
Sound needs a material medium to vibrate through, and space is a near vacuum.
A concave (diverging) lens causes parallel light rays to:
Answer: Spread apart
A concave lens diverges parallel rays, making objects appear smaller.
The pitch of a guitar string rises when the string is made:
Answer: Shorter and tighter
Shorter, tighter strings vibrate at higher frequencies, producing a higher pitch.
White light passing through a prism separates into colors because each color:
Answer: Bends by a different amount
Different wavelengths refract by different amounts, spreading white light into a spectrum.
A material that absorbs sound well, like foam, is used to:
Answer: Reduce echoes
Soft, porous materials absorb sound energy and cut down reflections and echoes.
The bending of light around the edge of an obstacle is called:
Answer: Diffraction
Diffraction is the spreading of waves as they pass an edge or through a gap.
Which color of visible light has the longest wavelength?
Answer: Red
Red light has the longest wavelength and lowest frequency in the visible spectrum.