The Invention of the Microwave

Who developed the RADAR technology?

• Albert Einstein

• Thomas Edison

• Nikola Tesla

• Christian Hülsmeyer is credited with the early development of RADAR technology.

What year did Percy Spencer notice the candy bar melted?

• 1940

• 1945

• 1935

• 1950

What device produced high-intensity microwaves?

• Resonator

• Magnetron

• Transmitter

• Oscillator

What happened to the popcorn kernels near the magnetron?

• The popcorn kernels freeze and become hard.

• The popcorn kernels remain unchanged.

• The popcorn kernels turn into liquid.

• The popcorn kernels near the magnetron heat up and pop.

What exploded onto Percy Spencer's colleague?

• A sandwich

• A soda can

• A chocolate bar

• A bag of chips

What is the first microwave oven based on?

• Radar technology and microwave radiation

• Chemical reactions

• Conventional heating elements

• Solar energy technology

What type of energy travels in waves?

• Kinetic energy

• Nuclear energy

• Electromagnetic energy and sound energy.

• Chemical energy

Which has a higher frequency, microwaves or gamma rays?

• Infrared rays

• Gamma rays

• Radio waves

• Visible light

What are the two types of waves mentioned?

• Transverse waves and longitudinal waves

• Radio waves and seismic waves

• Sound waves and light waves

• Mechanical waves and electromagnetic waves

What does the electromagnetic spectrum include?

• Earthquake waves

• Ocean waves

• The electromagnetic spectrum includes radio waves, microwaves, infrared radiation, visible light, ultraviolet radiation, X-rays, and gamma rays.

• Sound waves