First Amplifier
Transistor
Electret
Ribbon Mic/Speaker
Dynamic Loudspeaker
100

True or False, an amplifier amplifies sound.

True

100

True or False, The Transistor is bigger than the Triode Vacuum Tube.

False

100

What is the main material used in an electret microphone?

An Electret

100

What year was the Ribbon Speaker/Microphone invented?

1924

100

What year was the Dynamic Loudspeaker invented?

1924

200

What year was the first amplifier invented?

1906

200

What year was the Transistor invented?

1947

200

What years was the electret microphone being invented?

1962-64

200

How many inventors did the Ribbon Speaker and Ribbon Microphone have?

2

200

How many people invented the Dynamic Loudspeaker?

2

300

The first amplifier was invented by whom?

Dr. Lee De Forest

300

What group invented the Transistor?

Bell Laboratories

300

Who invented the Electret Microphone?

James West

300

What is the main material used in the Ribbon mic and speaker. 

Aluminum Ribbon

300

Who invented the Dynamic Loudspeaker?

Kellogg and Rice

400

What was the name of the first amplifier?

Triode Vacuum Tube

400

The Transistor was able to ___________ and ___________ the movement of electrons. 

Increase and Decrease

400

What kind of charge does an electret have?

A permanent charge

400

The Aluminum Ribbon helps convert sound waves into _______________.

Electrical Signal

400

The Dynamic Loudspeaker was mainly used to project sound where?

Movie theaters

500

How did the first amplifier adjust the volume of sound?

Controlling the movement of electrons

500

True or False, The Transistor requires MORE energy to function.

False

500

What is an example of an insulating material that an electret is made of?

Wax, Rosin

500

Who invented the Ribbon Mic and Speaker?

Walter H. Schottky and Dr. Erwin Gerlach

500

DAILY DOUBLE!!!!

What 2 materials were used in the Dynamic Loudspeaker

Metal coil and a magnet