Page 22 - Final Science BB Prep2 Part one (2nd term) 2024-2025_Neat
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Science Prep.2
Lesson 2: Wave Nature Of Light
Light:
It is a form of energy.
It is an external factor that affects the eye causing the sense of vision.
The Sun is the main source of light energy on the Earth’s Surface.
1-Nature Of Light Waves
G.R: light waves are electromagnetic transverse waves?
They are electromagnetic waves which can travel through vacuum and they are transverse
waves which it consists of crests and trough.
Speed of light:
The distance travelled by light in one second.
8
ሺ ሻ Speed Of light = 3 X 10
Speed Of light =
ሺ ሻ
Problem: Calculate the distance between the earth and the moon, if you know that the
reflected sunlight on the moon’s surface reaches the earth after 1.3sec.
……………………………………………………………………………………………………………………………………………………
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The Visible of light:
It is one of electromagnetic spectrum of wavelength
ranges between 380:700 nanometers.
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