The period of a wave is 2 seconds. What is the frequency?
Freq = 1 / period = 1/2sec, or 0.5Hz
100
True or False: cell phones use sound waves to communicate between the cell tower and the phone.
False. They use electro-magnetic waves
100
On a piano, the lower notes have a ____________ wavelength than the high notes
Lower notes have longer wavelength.
100
Electric power in this room is pulsing at 60 times a second. What are the frequency and period of that?
Frequency = 60 times a second
Period = (1/60)th of a second
200
The time for one cycle of a period motion
What is the Period?
200
The frequency of a wave is 440Hz (the note "A" on the piano)
What is the period of that wave?
period = 1 / frequency = 1 / 400 Hz = 1/400 seconds
200
What is the one place we know about in the Universe where there are NO WAVES?
There is no such place
200
Which is the longer wavelength: red light or blue light?
Red light has the longer wavelength
200
A boat is 6 meters long, you count 10 wave crests along the side of the boat. What is the wavelength of the water waves?
6 meters divided up into 10 parts, one wavelength = 0.6 meters
300
The number of cycle per second of a period motion
What is the Frequency?
300
If an ocean wave has a wavelength of 10 meters, and a frequency of 2Hz, what speed does the wave travel?
speed = frequency * wavelength
= ( 2Hz ) * ( 10 meters )
= 20 meters per second
300
We smell the shape of the molecule, or we smell how the molecule vibrates?
We smell by the vibrations in the molecule
300
The speed of light is ____________
300,000,000 meters per second
300
Ocean waves travel about 10 meters per second. What is the frequency of a 100 meter wave?
speed = freq * wavelength
10 m/s = freq * 100 m
0.1Hz = frequency
400
Water waves are Transverse waves - they go up and down perpendicular to the surface. Sound waves are difference, and called ________________ because they oscillate in the same direction as the sound is travelling.
What is Longitudinal Wave
400
sound travels 300 m / s. A musical note has a frequency of 256 Hz. What is the wavelength?
speed = freq * wavelength
300 m/s = 256Hz * wavelength
(300/256) meters = wavelength
Or, a little more than one meter long.
400
The three quantities that tell us everything we to know about the wave
What are
1) Amplitude
2) Frequency
3) Wavelength
400
A class did the waves experiment, wiggling the green rope. They counted 32 oscillations in 10 seconds. The rope is 5 meters long. What is the frequency and speed of their wave?
What is the difference between transverse and longitudinal waves?
Transverse waves oscillate perpendicular to the travelling wave. Longitudinal oscillate in the same direction as wave motion.
500
A lightwave travels at 300,000,000 meters per second. Red light wavelength is 700nm. What is the frequency of red light?
speed = freq * wavelength
300,000,000m/s = freq * (700 x 10^-9 meters)
freq = (3/7) x 10^15 Hz
500
In music, jumping up an octave means that you cut the wavelength in half. What happens to the frequency of the sound vibration when you go up an octave?
The frequency doubles
500
In music, jumping up an octave means that you double the frequency of the note. For example, Middle C is about 262Hz, so the C one octave higher has a frequency about 524Hz. What happens to the wavelength of the sound vibration when you go up an octave?