Busy. Please wait.
or

show password
Forgot Password?

Don't have an account?  Sign up 
or

Username is available taken
show password

why


Make sure to remember your password. If you forget it there is no way for StudyStack to send you a reset link. You would need to create a new account.
We do not share your email address with others. It is only used to allow you to reset your password. For details read our Privacy Policy and Terms of Service.


Already a StudyStack user? Log In

Reset Password
Enter the associated with your account, and we'll email you a link to reset your password.

Remove Ads
Don't know
Know
remaining cards
Save
0:01
To flip the current card, click it or press the Spacebar key.  To move the current card to one of the three colored boxes, click on the box.  You may also press the UP ARROW key to move the card to the "Know" box, the DOWN ARROW key to move the card to the "Don't know" box, or the RIGHT ARROW key to move the card to the Remaining box.  You may also click on the card displayed in any of the three boxes to bring that card back to the center.

Pass complete!

"Know" box contains:
Time elapsed:
Retries:
restart all cards




share
Embed Code - If you would like this activity on your web page, copy the script below and paste it into your web page.

  Normal Size     Small Size show me how

Telecomunication

QuestionAnswer
what is the speed of sound through air? 340m/s
What is the speed of light through air? 3,000,000,000
give an example where light and sound can be seen and heard at different moments. when lightning flashes
give the formula for measuring the speed of an object when you have the distance and the time. S=D/T
what is the amplitude of a wave? the size of maximum disturbance from the center position.
What is the crest? It is the peak point of the amplitude
Explain what the wave length is. It is the distance from one point on a wave to the next point on the next wave.
What is meant by the frequency? the number of waves passing a point in one second.
Define the wave speed. Distance traveled by a wave in one second.
How do you find the frequency of a wave if you are given the wave length and the speed? F=v/lamda
What is a transmitter? a tool hat sends out signals
Name the purpose of a receiver. it receives signals.
what is the angle of incidence? the angle of the light signal by the normal.
Name 3 advantages of optical fibers. Cheaper, smaller, lighter, greater signal capacity, higher signal quality, ect not faster!
How do optical fibers work? why? they work by using total internal reflection. this means that the angle of incidence is large meaning it reflects along the fiber without penetrating the fiber and escaping.
list the main components of a receiver. Aerial, tuner, decoder, amplifier loudspeaker.
What is an amplitude modulated wave (AM)? it is used as a signal and is a combination of a carrier wave and an audio signal.
Explain how a picture tube works. The picture tube contains an electron gun which fires electrons at a phosphor coated screen. the electron gun fires electrons at the screen where the kinetic energy of the electrons is turned into a spot of light.
Created by: AndyMac225