Sound Topic 5 Matter and Energy II

What is the maximum frequency that can be listened to by a human?

• 20 Hz

• 200 Hz

• 20 000 Hz

• 1 Hz

The speed of the sound in normal atmospheric conditions?

• 343 m/s

• 434 m/s

• 333 m/s

• This is not the answer

The sound travels faster through

• Gases

• Fluids

• Plasma

• Solids

Sections of a sound wave:

• Compression

• crest

• Rarefication

• trough

According to Doppler's effect, when the sound approaches to the listener the pitch is:

• High

• low

• soundless

• faster

What is a repeating disturbance that transfers or moves energy from place to place?  

• Medium

• Compression

• Wave

• Rarefaction

When 2 waves meet and the amplitude increases it is known as what?

• Destructive interference

• Amplitude addition

• Constructive interference

• Positive interference

Which wave behavior do noise cancelling headphones use?

• Destructive interference

• Constructive interference

When a wave bends around a barrier or passes through an opening, it is called

• Refraction

• Difraction

• Reflection

• Interference