Acoustics

When a sound wave travels through air,

the air particles

• vibrate along the direction of the wave

  motion

• vibrate but not in any fixed direction

• vibrate perpendicular to the direction of the wave motion

• do not vibrate

The frequency, which is audible to the

human ear is

• 50 kHz

• 20 kHz

• 15000 kHz

• 10000 kHz

The sound waves are reflected from an

obstacle into the same medium from

which they were incident. Which of the

following changes?

• speed

• frequency

• wavelength

• none of these

The velocity of sound is independent of

temperature.

• True

• False

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

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

Which graph has a longer wavelength?

• Top graph

• Bottom graph

• Same wavelength

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

• transmit

• diffract

• refract

• reflect

____ is used to describe sound waves that are reflected off of surfaces

• reflection

• reverberation

• vibration

• oscillation