Page 12 - Final Science BB Prep2 Part one (2nd term) 2024-2025_Neat

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Science Prep.2

Give reason:

1-We can't hear the sound of solar explosions but we can see the light coming
out of it.

Because sound is mechanical wave that need medium to propagate, while light

is electromagnetic wave that don’t need medium to propagate.

2-Light and radio waves are electromagnetic transverse wave?

Because they don’t need medium to propagate. Transverse: Because the
particles of the medium vibrate ⊥ to the direction of wave propagation

The concept of wave

motion:

1-Wave Length (λ ) two types: 2-Amplitude: 3-Wave velocity (v): 4-Frequency (F):

1-The 2-The wave length The maximum The distance covered The number of
wave of longitudinal displacement by wave in one second complete waves
length of Wave (λ) that is done by in one second.
transverse the particles of

Wave (λ) the medium
away
from their
point of rest.
-The -It is the distance

distance between two
bet. two successive
--------------------- Velocity= ----------------
successive compression or
crests or rarefactions.

troughs.

measuring unit: Measuring unit: meter Measuring unit:
meter (m) or per second (m/s). Hertz (Hz).
fractions of m:
Millimeter (mm) =

1x 10-3 m
Micrometer = 1x
10-6m

Nanometer = 1x
10-9 m

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