Podcast
Questions and Answers
Who is credited with the discovery of X-rays?
Who is credited with the discovery of X-rays?
- Wilhelm Conrad Röntgen (correct)
- Thomas Edison
- Marie Curie
- Nikola Tesla
What is the approximate wavelength range of X-rays?
What is the approximate wavelength range of X-rays?
- 100 nanometers to 100 picometers
- 10 nanometers to 10 picometers (correct)
- 1 millimeter to 1 micrometer
- 1 nanometer to 1 picometer
What is the frequency range of X-rays in hertz?
What is the frequency range of X-rays in hertz?
- 3 petahertz to 3 exahertz
- 300 exahertz to 300 zettahertz
- 30 petahertz to 30 exahertz (correct)
- 300 terahertz to 300 zettahertz
In which field are X-rays widely used for identifying weak points in construction materials?
In which field are X-rays widely used for identifying weak points in construction materials?
What were X-rays considered before their discovery in 1895?
What were X-rays considered before their discovery in 1895?
What is the frequency range of ultrasound used in ultrasonic devices?
What is the frequency range of ultrasound used in ultrasonic devices?
Who demonstrated that bats hunted and navigated by inaudible sound, not vision?
Who demonstrated that bats hunted and navigated by inaudible sound, not vision?
In which field is ultrasound used to detect invisible flaws in products and structures?
In which field is ultrasound used to detect invisible flaws in products and structures?
Who invented the Galton whistle, an adjustable whistle that produced ultrasound?
Who invented the Galton whistle, an adjustable whistle that produced ultrasound?
When was the first article on the history of ultrasound written?
When was the first article on the history of ultrasound written?
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Study Notes
X-rays
- Wilhelm Conrad Röntgen is credited with the discovery of X-rays.
- X-rays have an approximate wavelength range of 0.01 to 10 nanometers.
- The frequency range of X-rays is approximately 3 x 10^16 to 3 x 10^19 hertz.
- X-rays are widely used in non-destructive testing (NDT) for identifying weak points in construction materials.
Ultrasound
- Before the discovery of X-rays in 1895, they were considered to be unknown types of radiation.
- The frequency range of ultrasound used in ultrasonic devices is above 20,000 hertz.
- Biologist Donald R. Griffin demonstrated that bats hunted and navigated by inaudible sound, not vision.
- Ultrasound is used in non-destructive testing (NDT) to detect invisible flaws in products and structures.
- Francis Galton invented the Galton whistle, an adjustable whistle that produced ultrasound.
- The first article on the history of ultrasound was written in 1962.
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