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    Physics
    Grade-7
    Easy

    Question

    Direction : Identify the energy common in each of the examples given.
    How is light energy different than sound energy?

    1. Light energy moves slower.
    2. Light energy is what you see, and sound energy is what you hear.
    3. Light energy uses vibrations, and sound energy does not.
    4. Light energy is in a cell phone, and sound energy is not.

    Hint:

    Light energy is what you see and sound energy is what you hear

    The correct answer is: Light energy is what you see, and sound energy is what you hear.

      Light is a form of electromagnetic wave, whereas sound is a pressure density wave.
      Light does not require any medium to travel but some does require a medium to travel.
      The energy of light depends on the frequency of the incident light, but the energy of the sound depends on the amplitude of the incident sound.
      Light energy can be seen but sound energy cannot be seen.
      Sound energy can be heard but light energy cannot be heard.

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