Category: Grade 11

Constructive and destructive wave

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constructive wave :

A constructive wave id when two crests from opposite directions converge and the end result wave is the sum of the two crests.

destructive wave :

A destructive wave is when a crest and a troph from opposite directions converge.  the end result wave usually cancels out (no wave) or they act against each other.

 

How do noise-cancelling headphones use wave interference to eliminate unwanted sound?

A : The music going into the ear acts as a constructive wave.  Another wave is created through the headphones that acts as the troph with the same amplitude, and the background noise acts as the crest that creates a destructive wave that cancels out any noise.

Types of waves

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Pulse wave: A pulse wave is a non-repeating wave; single disturbance.

Pulse wave

Periodic : Periodic waves are waves that repeat at regular intervals.  they require regularly repeating disturbances in order to be considered a periodic wave.

Periodic wave

Longitudinal:  A longitudinal wave is when several turns of the spring are compressed and released.  The disturbance is in the same direction as the direction of travel.  This wave occurs lengthwise.

Longitudinal wave

Transverse: This wave occurs sideways.  The spring is pulled sideways at a 90 degree angle (right angle) then released.  The wave will travel across instead of lengthwise.

Transverse wave

 

 

 

Fahrenheit 451 Reflection

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Contributions : (pg.41-46)

  •  I completed and presented the literary luminary role.
  • Created 2 discussion questions and was prepared to assist with the discussion if necessary.
  • I made a total of 5 slides for the presentation with supporting images to go with each slide.
  • Created the title of the presentation.
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week 17 precalc

noahh2016 on

This week in precalc we finished our trigonometry unit with sine and cosine laws.  these are fairly simple concepts knowing that it’s just a formula and a little bit of algebra.  in Sine law you must remember that there can be two possibilities to an angle if it’s extraneous.

Sine law : \frac {a}{sinA} = \frac {b}{sinB} = \frac {c}{sinC}

cosine law : a^2 = b^2+c^2-ab(cosA)

\frac {b^2+c^2-a^2}{2bc}

example of sine law                                             example of cosine law