How do the crystals in a radio determine the recieved frequency?

Subject: How do the crystals in a radio determine the recieved frequency?

Date: Wed Mar 4 19:46:49 1998
Posted by G MacInnis
Grade level: other
School: No school entered.
City: Courtenay State/Province: BC
Country: CANADA
Area of science: Physics
ID: 889062409.Ph

Message:


How do the crystals in a crystal radio determine the recieved 
frequency? 

Do crystal radios have a coil? 

And last but not least...

How does a digital reciever pick any frequency instantly?

Thankyou.

Re: How do the crystals in a radio determine the recieved frequency?

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