Wave Interactions
A. When waves bend around edges of an obstacle?
B. When two or more waves overlap and combine?
C. When a wave bounces back from a surface?
D. When a wave enters a diff. medium and changes direction?
A. Diffraction
B. Interference
C. Reflection
D. Refraction
Mechanical waves require a "medium". What are 3 examples of mediums.
Solids, Liquids, Gases
The frequency of a sound wave was measured to be 489 Hz and the wavelength was measured to be 0.37 meters. What is the speed of the sound?
180.93 m/s
If sound travels at 340 m/s, how many seconds will it take thunder to travel 3 miles? (1 mile = 1609 meters)
14.20 seconds
Match the variables:
1. T a. frequency
2. v b. wavelength
3. d c. velocity
4. f d. period
5. /\ e. time
6. t f. distance
1. d - period
2. c - velocity
3. f - distance
4. a - frequency
5. b - wavelength
6. e - time
A. When a sound wave matches the natural frequency of another object, causing vibrations?
B. Natural frequency is when...?
C. Change in wave frequency is caused by...?
A. Resonance
B. frequency at which an object vibrates when it is disturbed
C. Doppler Effect
A. _______ waves travel perpendicular to the direction of vibration of the particles.
B. _______ waves travel parallel to the direction of vibration of the particles.
A. Transverse
B. Longitudinal
The period of a wave is 0.085 seconds and the wavelength is 7.2 meters. What is the frequency?
11.76 Hz
When a child presses a button on a toy car, the car produces a long "beep" sound with a frequency of 650 Hz. What is the period of the beep?
0.0015 seconds
What does the following formula determine?
T = 1/f
Period
Fill in the blank:
Resonance, Amplitude, Natural Frequency
A girl on a swing may increase the _______ of the swing's oscillations if she moves her legs at the _____ of the swing. This is an example of ______.
Amplitude, Natural Frequency, Resonance
The speed of sound, like all waves, depends on the _____ through which it travels. Sound travels fastest in _____ and slowest in _____.
The speed of salt water is 1,530 m/s. A whale just off the shore of NE wants to chat with another whale who is 7,230 km away. How long does it take for the second wale to hear the first whale say hello?
4,725.49 seconds
The sound of a dog bark travels through air at 235 m/s. Calculate the wavelength of the bark if its frequency is 820 Hz.
0.29 meters
What does the following formula determine?
v = d/t
Velocity
The amount of diffraction experienced by the wave depends on what 2 things?
The size of the opening, the wave's wavelength
1. In an area of COMPRESSION, particles _____?
2. In an area of RAREFACTION, particles _____?
1. ....are pushed closer together.
2. .... bounce apart again.
The frequency of a 345 meter wave traveling through water is 560 Hz. What is the period of this wave? How fast was the wave traveling?
Period = 0.0018 seconds
Velocity = 191,666.67 m/s
Using the formula Vsound = X + (0.6)(C), solve the following:
If the speed of sound in air is 331 m/s, what is the speed of sound at 65 degrees Celsius and -47 degrees Celsius.
1. 370 m/s
2. 302.8 m/s
How can the formula for frequency, using T, be substituted into the following?
v = f*/\
v = (1/T) / (/\)
Draw Constructive Interference and Destructive Interference and the result when the waves collide.
N/A
Labeled diagram of a wave.
N/A
You are sitting on the beach and notice that a buoy bobs up and down every 7 seconds. The waves are about 21 meters apart. What is the frequency, period, and wave speed for these waves?
Frequency = 0.14 Hz
Period = 7 seconds
Speed = 3 m/s
On a day the temperature is 18 degrees Celsius, you use a whistle to call your bird. If the wavelength of the sound produced is 0.009 meters, what is the frequency? Would you be able to hear the whistle?
37,977.78 Hz
No, it is above 20,000 Hz.
Create a new formula for "time" using the following.
v = d/t
t = d/v