Physics CP05 Electromagnetic waves

• Why does a goldfish appear closer to the surface of the water than it actually is?

  Because light is refracted as it passes from the water to the air.
• What happens to light as it passes from water to air?

  It is refracted.
• What is scattering in the context of waves?

  It is the spreading out of waves as they pass through a medium.
• How does infrared radiation behave in the atmosphere?

  It is scattered by the molecules in the atmosphere.
• Why does the sky appear blue?

  Because blue light is scattered more than red light.
• What is the electromagnetic spectrum?

  A continuous range of electromagnetic waves arranged in order of their frequency.
• Which part of the electromagnetic spectrum has the longest wavelength?

  Radio waves
• Which part of the electromagnetic spectrum has the highest frequency?

  Gamma rays
• What does the term "electromagnetic spectrum" refer to?

  A continuous range of electromagnetic waves.
• What is the definition of wavelength in the context of waves?

  The distance between two adjacent crests.
• What is the definition of frequency in the context of waves?

  The number of waves passing a point each second.
• What is the definition of amplitude in the context of waves?

  The distance from the rest position to a crest.
• What are the main uses of infrared radiation?

  • Remote controls for televisions
  • Security systems
  • Thermal imaging cameras
• What are the main uses of ultraviolet radiation?

  • Sunbeds
  • Sterilizing equipment
  • Fluorescent lamps
• What are the dangers of exposure to ultraviolet radiation?

  • Sunburn
  • Skin cancer
  • Premature aging of the skin
  • Eye damage
• What is the aim of the core practical investigating reflection?

  To investigate the relationship between the angle of incidence and the angle of reflection.
• What does the law of reflection state?

  The angle of incidence is always equal to the angle of reflection.
• What is the angle of incidence?

  The angle between the incident ray and the normal.
• What is the angle of reflection?

  The angle between the reflected ray and the normal.
• What is diffuse reflection?

  Reflection of light from rough surfaces in many different directions.
• What happens to the reflected ray as you change the angle of incidence?

  It follows the law of reflection.
• What happens to light when it hits a rough surface?

  It is deflected to various angles.
• What is the relationship between the angle of incidence and the angle of reflection in the provided data?

  They are equal.
• What is the order of colors in the visible spectrum?

  Red, orange, yellow, green, blue, indigo, violet.
• How do different types of electromagnetic waves behave when passing through materials?

  They cannot pass through certain materials like glass.
• What are three effects of electromagnetic waves?

  Heating, ionization, and reflection.
• What is the speed of light in relation to its wavelength?

  The speed of light is independent of its wavelength.
• How do radio waves behave compared to light waves?

  Radio waves can be bent around obstacles more easily than light waves.
• What is the relationship between frequency and the colors we see?

  The colors we see are determined by the frequency of light.
• What happens when sunlight passes through water droplets?

  It creates a rainbow of colors.
• What is the effect of high frequency and energy of gamma rays?

  They cause damage to living things.
• How do electromagnetic waves differ in properties?

  They have different wavelengths causing them to have different properties.
• Which pair of the electromagnetic spectrum has the highest frequency?

  Gamma rays and X-rays
• What type of wave is infrared?

  Electromagnetic wave
• In what order are colours arranged in the visible spectrum?

  Red, orange, yellow, green, blue, indigo, violet
• How do we know that different types of electromagnetic waves cannot pass through certain materials such as glass?

  Because they are absorbed or reflected by the material
• Why do we see a rainbow of colours when sunlight passes through water droplets?

  Because different colours of light have different wavelengths
• What determines the colours we see?

  The frequency of light
• What happens when you turn on a phone lamp?

  Your eyes detect the light emitted
• List three different effects of electromagnetic waves.

  • Heating of materials
  • Damage to living tissues
  • Communication signals