Vibrations and Waves

Flashcards covering key concepts from the lecture on vibrations and waves.

What spectrum are gamma waves found on?

Electromagnetic spectrum.

What phenomenon describes the change in frequency or wavelength of a wave in relation to an observer moving towards or away from it?

The Doppler effect.

Two different things that we can experience to recognize a sonic boom

Supersonic jet & a whip

If you are sitting in a room with an open door and it is left open and another door is slammed shut what is that called

Rarefaction.

What does a tuning fork do

Make forced vibrations

What do we call sound waves that have a frequency below 20 Hz?

Infrasonic.

What type of waves are created when a boat moves through water?

Bow waves.

What two factors determine the period of a pendulum?

Gravity and length of the pendulum.

What is the equation used to calculate the speed of a wave?

Wavelength times frequency.

What is another example of the Doppler effect aside from sound?

Space expanding & airplanes

What is the phenomenon called when you hear two or three beats from overlapping waves?

Constructive interference.

Who would benefit from using noise-canceling headphones?

Airports, people with hearing sensitivity, and construction workers.

What occurs when the natural frequency of an object matches the frequency of the applied vibration?

Resonance.

What is the name of the wave pattern that goes up and down?

Sine curve.

What travels faster: sound or light?

Light travels faster than sound.

What two types of radio signals can be tuned to match natural frequency?

AM and FM radio.

What do we call the time it takes for a ball on a string to go and come back?

Period.

What are the two kinds of waves discussed in class?

Transverse and longitudinal.

If we were in a theater and a band or orchestra was playing and there appeared to be a dead spot what is that called

Destructive interference

If the waves are going farther from you in space terms what is that called

Redshift.

What happens when the natural frequency and forced vibration of an object match?

Resonance can cause structural failure, like a bridge collapse.

When he puts patterns on each other what are the patterns doing to each other

Causing constructive interference

What is the lowest point of a sine curve called?

Trough.

If four and a half waves pass a point in one second, what is the frequency?

4.5 Hz.

What is another term for the period of a ball on a string swinging back and forth?

Wavelength.

What is classified as a wiggle in time?

Vibration.

What type of waves have a long wavelength?

Low frequency waves.

What term describes the waves created when two different waves interact in a jump rope?

Node.

When boats pass us in water the waves pass us in one dimension, what is it called when it passes in a dimension

Doppler Effect

What is the term for sound that has a frequency above the audible range (20,000 Hz)?

Ultrasonic.

What is the term used when sound waves compress the air and disturb drapes?

Compression.

What factors influence the frequency of an object?

Material and shape of the object.

Who tragically passed away during the bridge collapse caused by resonance?

A dog.

What device can measure sound intensity?

Oscilloscope.

What unit is commonly used to measure sound levels?

Decibels.