Information in Radio Waves
Name: ______Class: ______Date: ______
History of Radio Assessment
Part 1: Matching - Match each person to their contribution to radio science
___ / 1.) Grote Reber / a - / Discovered the center of our Galaxy while working at Bell Telephone Company.___ / 2.) Reginald Fessenden / b - / First man to produce and detect radio waves in lab.
___ / 3.) Karl Jansky / c - / Predicted the existence of the 21-cm Hydrogen line.
___ / 4.) James Stanley Hey / d - / He invented Amplitude Modulation (AM).
___ / 5.) James Clerk Maxwell / e - / Built a parabolic radio telescope in his backyard and mapped the brightness of radio signals in the sky.
___ / 6.) Jan Oort / f - / First man to successfully detect radio emissions from the Sun
___ / 7.) Orson Welles / g - / Conducted the fourth test of Einstein’s theory of relativity.
___ / 8.) Heinrich Rudolf Hertz / h - / Through mathematics, he provided evidence that electromagnetism could exist at any wavelength.
___ / 9.) Irwin Shapiro / i - / Inventor of the first device to send a transatlantic message wirelessly.
___ / 10.) Guglielmo Marconi / j - / Radio broadcaster who did live reading of “The War of the Worlds.”
Part 2: Short Answer
1.) What is the difference between AM and FM radio?
2.) Where is the largest radio telescope in the world found?
3.) How was information first encoded into a radio wave?
4.) Around what period of time was AM radio getting its first major usage?
5.) Why is Orson Welles famous? What famous event is he known for?
6.) What significant astronomical thing did Karl Jansky discover in the 1930’s?
7.) What is a sidereal day? How long is it?
8.) What does a parabolic dish do?
9.) Where did James Stanley Hey detect radio signals from?
10.) Grote Reber built his own what in his backyard during the Great Depression?