4th Period - More Waves

Which wave in the diagram has the greatest frequency?

• 1
• 2
• 3
• 4

Which of the following is TRUE about standing waves? 

• Standing waves have boundaries in which the waves are found within
• The speed of each harmonic is constant (the same) 
• By increasing the frequency by specific values one increases the harmonic #
• All answers are correct 

Based on the picture, which of the following is FALSE? 

• The picture shows the first 5 Harmonics 
• The fundamental has the largest wavelength of all harmonics 
• The 4th harmonic has a greater frequency than the 5th harmonic
• The 2nd harmonic has 1/2 the wavelength as the fundamental

A standing wave is oscillating at 1 Hz on a string shown in the figure, creating fundamental pattern you can see.  The boundary between the student's hand and the fixed end is 2 meters.  Which of the following is TRUE? 

• The wave speed is 4 m/s for all three (3) harmonics
• The size of the wavelength for the fundamental is 4 meters 
• The frequency of the 3rd harmonic is 3 Hz
• All answers are correct 

Based on the picture: A string is 3.0 meters long is fixed at both ends.  The speed of the wave is 18 m/s. What is the frequency of the standing wave shown in the figure? 
*speed = frequency x wavelength

• 6 Hz
• 12 Hz
• 18 Hz
• 36 Hz

In the picture we see two waves approaching one another on opposite sides of equilibrium.  Wave A has an amplitude of +2 and Wave B has an amplitude of -2.  Which of the following is FALSE? 

• The waves will destructively interfere with one another 
• In standing waves, we find destructive interference where we find anti-nodes
• At the site of interference there will be zero net amplitude
• Since waves are energy moving through a medium, the waves will continue moving past one another after they interfere

The speed of propagation of a transverse wave on a 2 meter long string fixed at both ends is 10 m/s.  *Which frequency would NOT create standing waves?

• 5 Hz
• 8 Hz
• 10 Hz
• 15 Hz

Which statement is TRUE about a surface wave? 

• Surface waves are non-mechanical waves
• Surface waves are transverse waves
• Surface waves are longitudinal waves 
• Surface waves, also called circular waves, have BOTH transverse and longitudinal wave properties

Which of the following is FALSE about a sound wave?  

• Sound is a mechanical wave
• Sound travels faster in colder air than warmer air
• Sound that reflects is called an echo
• Sounds can come in a wide range of frequencies

2 Parts: The interaction known for when waves bend while traveling through a new medium is called ______ and _____ (is or is not) shown in the picture?

• Reflection; is not
• Refraction; is
• Diffraction; is 
• Interference; is not