Worksheet on Electromagnetic Spectrum

Which EM wave has the lowest frequency?

• Infrared

• Radio waves

• Microwaves

• Ultraviolet

The speed of all EM waves in a vacuum is approximately:

• 3×10^8 m/s

• 3×10^6 m/s

• 3×10^4 m/s

• 3×10^2 m/s

Which sequence is arranged in order of decreasing wavelength?

• Ultraviolet → Visible → Infrared → Radio waves

• Radio waves → Infrared → Visible → Ultraviolet

• Gamma rays → X-rays → Visible → Microwaves

• Infrared → Gamma rays → Visible → Radio waves

Which type of EM wave has the highest energy?

• Gamma rays

• Microwaves

• Infrared

• Radio waves

Which property is common to all EM waves?

• They need a medium to travel

• They travel at the same speed in vacuum

• They all have the same frequency

• They are only visible

Which wave is used in radar technology?

• Radio waves

• Microwaves

• Infrared

• Ultraviolet

Which of the following correctly matches the wave with its wavelength range?

• Visible light - 400 to 700 nm

• Radio waves - 0.1 to 1 nm

• Gamma rays - meters long

• Infrared - shorter than X-rays

The main difference among EM waves in the spectrum is their:

• Speed

• Wavelength and frequency

• Direction of travel

• Medium of travel

Which wave is often used in thermal imaging?

• Infrared

• Gamma rays

• X-rays

• Microwaves

Which of the following correctly describes microwaves?

• They have longer wavelengths than radio waves

• They are used for cooking and communication

• They are ionizing radiation

• They travel slower than visible light