OCR A Level Physics

Topic Questions

A LevelPhysicsOCRTopic Questions4. Electrons, Waves & Photons4.7 EM Waves

4.7 EM Waves

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1
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A star exploded in the milky way galaxy emitting electromagnetic radiation. X-rays and microwave radiation from this burst were detected simultaneously at the Earth.

The wavelength of the X-rays was 2.5 ✕ 10−9 cm.

What is the frequency of the X-rays?

  • 1.2 ✕ 1019 Hz

  • 1.2 ✕ 1017 Hz

  • 1.2 ✕1015 Hz

  • 1.2 ✕1013 Hz

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2
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Which of the following waves can be polarised and has a typical wavelength of about   2 × 10−7 m?

  • Ultraviolet Radiation

  • Sound Waves

  • X-Rays

  • Radio Waves

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3
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Which statement(s) are correct about an electromagnetic wave?

  1. It can be diffracted and polarised
  2. Its oscillations are parallel to the energy transfer
  3. It can travel through a vacuum
  4. It has a speed of less than  3.00 ✕ 108 m s–1 when travelling through denser medium

  • 1,3 and 4

  • Only 1 and 4

  • Only 2 and 3

  • Only 1

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4
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What statement can be deduced from a table presenting frequencies in the electromagnetic spectrum?

  • The frequency of radio waves is greater than the infrared waves

  • The frequency of X-rays is greater than that of radio waves

  • The frequency of X-rays and gamma rays are equa

  • The frequency of gamma rays is less than X-rays

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