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QUARTER 3 SCIENCE
SOLVING
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Cards (7)
How many periods are there in Figure
A
?
Ans: Period (T)=
5 seconds
What is the frequency of Figure A? Show solution
Ans:
f= 1/T
=
1
/5 seconds
=
0.2 Hz
The sound has a frequency of 426 Hz. What is the period?
ans:
0.02 seconds
A hiker shouts toward a cliff. The returning echo has a frequency of 20.0Hz. Find the period.
ans:
0.05 seconds
Speed
: The speed or velocity of a wave is how fast the energy is moved.
Of the three mediums (gas, liquid, and solid) sound waves travel the slowest through
gases
,
faster
through
liquids
, and fastest through
solids.
A wave has a frequency of 900Hz and a wavelength of 200m. At what
speed is this wave travelling?
Given:
f = 900Hz
lambda =200m
Unknown:
v=
?
Formula:
v=
flambda
Solution:
v= 900Hz * 200m
v= 180,000m/s
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