Physics
Grade-7
Easy
Question
Direction : Identify the energy common in each of the examples given.
How is light energy different than sound energy?
- Light energy moves slower.
- Light energy is what you see, and sound energy is what you hear.
- Light energy uses vibrations, and sound energy does not.
- 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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¶Before being employed as power, machines were frequently used to convert various energy sources. We can use mechanical energy any way we want or need it to function once it has been altered in a specific way. E.g., A tool that works by using mechanical energy is a hammer. A hammer's ability to exert force on a nail to move it is made possible by the mechanical energy it possesses. The hammer can function on the nail because it possesses mechanical energy (kinetic energy). Work-enabling energy is known as mechanical energy.
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¶
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¶
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