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O LevelPhysicsCambridgeExam Questions3. Waves3.3 Electromagnetic Spectrum

Electromagnetic Spectrum (Cambridge O Level Physics)

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3.3 Electromagnetic Spectrum

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3.3 Electromagnetic Spectrum

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1
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The table below shows the entire electromagnetic spectrum. It runs in order of increasing frequency.

Three parts of the spectrum are missing.

radio waves

X

infrared 

visible light

Y

x-rays

Z

What are parts X, Y and Z?

 

X

Y

Z

A

ultraviolet

microwaves

gamma rays

B

microwaves

gamma rays

microwaves

C

gamma rays

ultraviolet

microwaves

D

microwaves

ultraviolet

gamma rays

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    2
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    The table below shows the entire electromagnetic spectrum. It runs in order of increasing wavelength.

    Which region is microwaves?

    γ-rays

    A

    B

    C

    infrared

    D

    radio waves

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      3
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      The electromagnetic spectrum is shown in the table below.

      γ-rays

      x-rays

      ultraviolet

      visible light

      infrared

      microwaves

      radio waves

      q3-easy-mcq-3-3-electromagnetics-spectrum-cie-igcse-physics

      Which word is missing from the box below the electromagnetic spectrum?

      • Wavelength

      • Speed

      • Frequency

      • Amplitude

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      4
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      Which list shows the parts of the electromagnetic spectrum in order of decreasing wavelength?

      • γ-rays, X-rays, infrared

      • Radio waves, ultraviolet, microwaves

      • Microwaves, infrared, visible light

      • Ultraviolet, visible light, infrared

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      5
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      Which of the following groups contains only electromagnetic waves?

      • Sound waves, γ-rays, X-rays.

      • γ-rays, microwaves, sound waves.

      • Radio waves, infrared waves, γ-rays.

      • Radio waves, sound waves, microwaves.

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      1
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      Which of the following sentences about infrared waves is true?

      • They can be used to treat cancerous tumours.

      • They can be used to make images of bones, through the skin.

      • They can be used for cooking.

      • They are used to send communication signals to satellites.

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      2
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      Which type of electromagnetic wave is used in remote controls?

      • Microwaves

      • Visible light

      • Ultraviolet

      • Infrared

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      3
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      A forgery detector is used to check whether bank notes are genuine or counterfeit. A type of electromagnetic radiation is shone onto the banknote which makes special ink in the note glow.

      Which type of electromagnetic radiation is shone onto the banknote?

      • Ultraviolet

      • Infrared

      • Visible light

      • X-rays

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      4
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      The table gives common uses of electromagnetic radiation.

      Which row correctly matches the type of electromagnetic radiation with its use?

       

      Detecting banknote forgery

      TV remote controllers

      Sterilising medical instruments

      A

      microwaves

      visible light

      microwaves

      B

      infrared

      infrared

      γ-rays

      C

      ultraviolet

      radio waves

      infrared

      D

      ultraviolet

      infrared

      γ-rays

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        5
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        Visible, red light has a wavelength of around 700 x 10-7 m.

        Two other types of electromagnetic radiation, X and Y, have different wavelengths to the visible, red light.

        Wavelength of X = 400 x 10-7 m
        Wavelength of Y = 3.0 x 10-2 m

        Which types of radiation could X and Y be?

         

        X

        Y

        A

        visible blue light

        microwaves

        B

        x-rays

        ultraviolet

        C

        infrared

        radio waves

        D

        microwaves

        ultraviolet

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          6
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          In what way are microwaves different from ultraviolet waves?

          • Ultraviolet waves travel faster than microwaves in a vacuum.

          • Microwaves have a longer wavelength than ultraviolet waves.

          • Microwaves have a higher frequency than ultraviolet waves.

          • Microwaves are longitudinal while ultraviolet waves are transverse.

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          7
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          Which of the following types of electromagnetic radiation has the highest speed in a vacuum?

          • Microwaves

          • Radio waves

          • Visible light

          • None of the above

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          1
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          Which of the following options shows the correct speed for electromagnetic waves in a vacuum?

          • 3.0 × 104 cm / s

          • 3.0 × 108 cm / s

          • 3.0 × 1010 cm / s

          • 3.0 × 108 km / s

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          2
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          Mobile phone networks rely on electromagnetic radiation to transmit signals.

          Which of the following statements is correct?

          • Radio waves are used for mobile networks because they travel over long distances and easily penetrate walls

          • Microwaves are used for mobile networks because they can operate with a short aerial and easily penetrate walls

          • Infrared waves are used for mobile networks because they travel over long distances and are not damaging to soft tissue

          • Ultrasound waves are used for mobile networks because they can travel to the satellites in space

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          3
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          Bluetooth devices rely on electromagnetic radiation to transmit signals.

          Which of the following statements is correct?

          • Visible light is used by Bluetooth-enabled devices because it undergoes total internal reflection in optical fibres

          • Gamma waves are used by Bluetooth-enabled devices because they penetrate easily through walls

          • Microwaves are used by Bluetooth-enabled devices because they can reach satellites in orbit as they are not absorbed by the ionosphere

          • Radio waves are used by Bluetooth-enabled devices because they transmit very well over short distances

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          4
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          Which line in the table correctly identifies a use and a danger of the electromagnetic wave given in the first column?

            EM wave Uses Dangers
          A. gamma detection of cancers internal heating of body cells
          B. x-rays detecting false bank notes mutation or damage to body cells
          C. visible photography mutation or damage to body cells
          D. infrared thermal imaging skin burns

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