Characteristics Of Waves
The speed of a wave is 100 m/s and it has a period of 15 seconds. What is the wavelength?
1500m.
Throw everything you know of efficiency out the window. Suddenly machines can have efficiencies of over 1. You are utilizing this new miracle machine. You put in 1500 joules of effort and it produces an out of 3000 joules. What is the efficiency?
200%.
The definition of a wave, as pertaining to our notes, is:
A wave is a disturbance that carries energy through matter and space.
The combining of two or more waves of the same frequency that results in a single wave is called:
Superposition.
How does Ultrasound work?
The echoes of very high frequency waves are used to produce computerized images.
The lowest point of a wave is called:
Trough.
Alyssa Davis cant sit in her seat for more than 30 seconds. One time when out of her seat she decided to move a chair out of her way. Her efficiency was 1%, while the work she put in to move the chair was 151 joules. What is the output?
1.51 joules.
What kind of wave does a microwave put out?
Microwaves.
When a wave loses energy as it transmits into a material it is called:
Absorption.
What is the point at which two objects naturally vibrate at the same frequency?
Resonance.
The distance a particle is displaced from its resting place, otherwise known as how tall the wave is:
Amplitude.
You put 10,000J of input into an effort and have 4,000J of waste. What is your waste?
4,000J.
What is an example of an electromagnetic wave?
Light waves.
True or False: The only difference between a reflection at a fixed boundary and reflection at a free boundary is that a reflection at a free boundary flips upside down, instead of just opposite.
True.
How does SONAR work?
A signal wave is sent out and when it hits something it bounces back to the source, which is then calculated using speed, distance and time.
The highest point of a wave is:
Crest.
TRUE OR FALSE:
Perpetual Motion Machines currently exist.
False.
Sound waves are an example of a:
Longitudinal waves.
The bending of waves as they pass an edge (or pass through an opening) is called:
What is the threshold of hearing?
The lowest (quietest) point at which a person can hear.
The distance from crest to crest or trough to trough:
Wavelength.
What is the difference between an open and closed system?
An open system allows the exchange of materials back and forth freely, while a closed system does not.
How do your vocal cords produce sound?
The bouncing back of a wave when it meets a surface or boundary is:
Reflection.
David is the captain of the USS Talks a Lot. They send out SONAR signals underwater, attempting to locate the nefarious pirate One-eyed Hutton. They get a signal 7000 meters away. Assume the speed of water is 1500 m/s. How long until they reach One-eyed Pinkerton? Speed = distance/time.
4.67 seconds.