C.2 Waves

What type of wave is sound?

• Mechanical wave

• Electromagnetic wave

• Longitudinal wave

• Transverse wave

How is the speed of sound related to air temperature?

• Speed decreases as temperature decreases

• Speed doubles as temperature doubles

• Speed increases as temperature decreases

• Speed is not related to temperature

What happens when a wave reflects from a barrier?

• There are no changes in direction, speed, wavelength, frequency, or phase

• Frequency changes

• Speed increases

• Wavelength doubles

What is the Principle of Superposition?

• The displacement of a medium is equal to the sum of the displacements of individual waves

• Waves increase in speed when they overlap

• The frequency of a wave doubles when it meets another wave

• Waves cancel each other out when they meet

What does a mechanical wave require to transfer energy?

• High temperature

• Electromagnetic fields

• A medium

• A vacuum

What is the Doppler Effect?

• The change in frequency of a wave in relation to an observer who is moving relative to the wave source

• The reflection of sound after hitting a surface

• The absorption of sound in a medium

• The decrease in amplitude of a wave over distance

How can the speed of a wave be changed?

• By changing its frequency

• By changing its amplitude

• By changing the medium it travels through

• By changing its wavelength within the same medium

What is resonance?

• The increase in amplitude when two waves meet

• The decrease in amplitude when two waves meet

• The phenomenon that occurs when an object vibrates at or near a resonant frequency of another object, causing the second object to vibrate at a higher amplitude

• The reflection of sound waves from a surface

What characteristic(s) of a wave must remain the same as the wave crosses a boundary between two different media?

• Frequency

• Wavelength

• Amplitude

• Speed

What happens to the diffraction pattern as the width of the opening decreases?

• It remains unchanged

• It disappears

• It becomes more focused

• It spreads out more