Sound waves

Which of the following is correct about the concept of diffraction?

• It is the increase in speed of a wave as it changes medium.

• It is the dramatic change in frequency of a wave as it moves past another object

• It is the change in direction the wave as it goes through an opening.

• It is bouncing of a wave off a distant surface.

• It is when one object vibrating at the same natural frequency of a second object forces that second object into vibrational motion

What happens to a sound wave when it is refracted?

• The sound wave bends as it passes through an opening.

• The sound wave diminishes it goes into a new material.

• The sound wave bounces into a surface as it changes direction.

• The sound wave changes direction and changes the speed it is travelling at when it crosses a boundary.

• The sound wave bounces off a surface as it changes direction.

Which of the choices best completes the following statement: Compared to a sound of 80 decibels, a sound of 50 decibels…

• has a frequency that is 10^3 times more.

• is 30 times more loud.

• has a wavelength that is 10^3 times shorter.

• has a pitch that is 10^3 times quieter.

• is 10^3 times quieter.

Sound is a(n) __________ wave caused by vibrations of matter.

• compressional

• light

• electromagnetic

• infrared

• water

What is the state of matter of a sound wave travelling through when it has a wavelength of 2.3 m and a frequency of 655 Hz?

• liquid water

• 1499 m/s

• 65 m/s

• solid metal

• air

When the inverse of the period of a sound wave is increased, the sound will now …

• not have the capability to go a great distance.

• have a lesser speed.

• be much louder.

• have a higher tone

• have a bigger wavelength.

Leah is using her 329.63 Hz tuning fork to tune a guitar string. When the string and the tuning fork are played at the same time, she hears a beat frequency of 6 Hz. She then tightens the string and hears a beat frequency of 3 Hz.

• Loosen the string.

• Make the string longer.

• Continue tightening the string.

• Leave it alone, it is now in tune.

• Call someone that can tune the guitar.

What causes the sound waves of different frequencies to have alternating loud and soft beats?

• Absorption of the frequencies

• Diffraction of the amplitudes

• Interference of the differences in frequencies

• Refraction of the rarefactions

• Reflection of the frequencies

How is a loud sound different from a quiet sound?

• The loud sound has a higher amplitude

• The loud sound is snail like.

• The quiet sound has a higher amplitude.

• The quiet sound has a higher wavelength.

• The loud sound has a larger pitch.

Which of the following makes the speed of sound slower in air?

• Volume is softer.

• Temperature is colder.

• Air is warmer.

• Amplitude is larger.

• Rarefaction is larger.