Prelim Exam_Building Utilities 3

What is a "medium" in Physics

• When the sound wave goes in between two things

• The material a wave travels through

• A repeating disturbance that transfers energy over a distance

• When air particles vibrate

Which medium will sound travel through the fastest?

• Air

• Metal

• Water

• Space

Fill in the blank: Sound Waves travel fastest through solids because the atoms are ___________ compared to atoms in liquids and gases

• Closer together

• Farther apart

• Harder

• Smaller

How does the decibel scale work?

• +10 dB = +10 louder

• x2 dB = +10 louder

• +10 dB = x2 louder

• x2 dB = x2 louder

What is "frequency"?

• Number of times wave repeats in image

• Number of times wave repeats in 1 second

• Length of one wave

• How often the wave happens

________is a science that deals with the production, control, transmission, reception, and effects of sound

• Sound

• Sound System

• Acoustics

• Sound Physics

Acoustics is classically divided into sound and _______

• infrasonic waves

• vibration

• oscillation

• ulfra-sonic waves

Hard surfaces, such as ceramic tile, gypsum board, or wood, tend to _______ sound waves, causing ‘echo’.

• transmit

• diffract

• refract

• reflect

Soft surfaces, such as textiles, and bath insulation, tend to _______ sound waves, preventing them from further motion

• transmit

• reflect

• diffract

• absorb

AUDIO FREQUENCY RANGE OF HUMANS

• 20-20,000 hz

• 50-75,000 hz

• 5-50,000hz

• 30-30,000 hz