Waves Test

The reason that a police car’s siren sounds HIGHER in pitch as it approaches you, is because the truck pushes the sound waves together so that the sound wavelengths in front of the truck gets shorter. This causes the 

• Frequency to increase, which increases the pitch

• Velocity to decrease, which increases the frequency

• Frequency to decrease, which decreases the pitch

• Wavelengths to get longer, which increases the pitch

What is the frequency of a wave with a period of 2 seconds?

• 2 Hz

• 1 Hz

• 0.5 Hz

• 3 Hz

A bee produces a sound with a wavelength of 3.2 m and the speed of sound is 345 m/s. What is the frequency of this sound?

• 1104 Hz

• 341.8 Hz

• 0.009 Hz

• 107.8 Hz

A wave with a speed of 25 m/s has a frequency of 400 Hz. What is the wavelength of the wave?

• 16 m

• 375 m

• 0.0625 m

• 400 m

A wave traveling at 300 m/s has a wavelength of 6.7 meters. What is the frequency of this wave?

• 2010 Hz

• 0.02 m/s

• 300 Hz

• 44.7 Hz

A wave has a frequency of 450 Hz and a wavelength of 4 meters. At what velocity will this wave travel?

• 112.5 m/s

• 1800 m/s

• 454 m/s

• 0.008 m/s

The diagram illustrates what happens when white light passes though a glass prism.

Which phrase best describes this phenomenon?

• reflection and interference

• transmission and the Doppler effect

• scattering and diffraction

• refraction and dispersion

Which of the following diagrams best represents the phenomenon of refraction?

• 
• 
• 
• 

Mechanical waves differ from electromagnetic waves because mechanical waves

• travel through empty space.

• get their energy from the Sun.

• cannot be refracted around corners.

• cause particles in a medium to vibrate.

Why is lightning visible before thunder is heard?

• Sound travels slower than light can travel.

• Light needs a medium to travel through

• Sound cannot reflect off of surfaces as easily as light.

• Sound is not processed by the brain as fast as light.