Radio — Questions and answers
Read the full story
What was the main limitation of Heinrich Hertz's groundbreaking experiments?
Choices
- A) They used too much electricity.
- B) They could only send electromagnetic waves over very short distances. ✓
- C) Scientists found them boring and uninteresting.
- D) The waves made strange, loud noises.
Answer: B) They could only send electromagnetic waves over very short distances.
From page 3
What was Guglielmo Marconi's main goal as an inventor?
Choices
- A) To discover a new planet.
- B) To make wireless telegraphy work over long distances. ✓
- C) To write a famous science book.
- D) To build a new type of bicycle.
Answer: B) To make wireless telegraphy work over long distances.
From page 4
How did Marconi's first system generate radio waves?
Choices
- A) By blowing air into a special tube.
- B) By creating a visible spark across a gap between electrodes. ✓
- C) By shining a bright light at a mirror.
- D) By using magnets to pull waves out of the air.
Answer: B) By creating a visible spark across a gap between electrodes.
From page 5
What special device did Marconi use to detect the faint, invisible radio waves?
Choices
- A) A magnifying glass
- B) A coherer ✓
- C) A musical instrument
- D) A powerful light bulb
Answer: B) A coherer
From page 6