Ch. 25, Day 2

May 13 & 14, 2014

Do Now1. Take a clicker2. Take a Do Now – complete the front and back!3. Don’t forget to turn in your HW

HW tonight: 12 points - TBA on next slide

FYI - Coming Up Soon…4. TEST on CH. 25-26 on May 21 (A day) & 22 (B day)5. PRINT your study guide !– It’s on the website. – Know you can’t / won’t print it? Let me know – I made

a few extra copies

HW tonight (you’ll get this at the end of class): EXTRA MATH PRACTICE - see instructions below

1. READ the sample problem on page 1.2. Solve 2 problems (your choice) from #1-5 on loose leaf3. READ the sample problem on page 2.4. Solve 2 problems (your choice) from #6-10 on loose leaf5. READ the sample problem on page 3.6. Solve 1 problem (your choice) from #11-12 on loose leaf7. Solve 1 problem (your choice) from #13-15 on loose leaf12 points – 2 points per problem. SHOW ALL WORK including FORMULAS to get full credit. Feel free to do more than what is assigned for extra practice.

Coming Up Soon…• You have a TEST on CH. 25-26 on May 21 (A day) & 22 (B

day)• PRINT your study guide – it’s on the website. Know you can’t

/ won’t print it? Let me know – I made a few extra copies

Add this chart to last class’ notes, or at least the stuff in red!

What it is What it’s measured in

Formula What question should I be

asking myself?Frequency (f) Hertz

(the INVERSE of seconds)

f = 1 T

How many waves PER SECOND?

Period (T) Seconds T =_1_ f

How MANY SECONDS for ONE wave?

Keep in mind… sometimes, you don’t need to use a formula! Sometimes all it takes is common sense…don’t make this too difficult! Ask yourselves the above questions first…if you can’t answer them at first, THEN try doing the math!

1a. What is the wavelength?

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0% A. 1.2 cmB. 3.2 cmC. 6.2 cmD. 15.5 cmE. 2.5 cmF. Answer is not listed

1b. What is the amplitude?

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0%

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0% A. 1.2 cmB. 3.2 cmC. 6.2 cmD. 15.5 cmE. 2.5 cmF. Answer is not listed

2a & b. A kid on a playground makes 1 complete to and fro swing each 2 seconds. The

frequency is _____ and the period is _____

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0%

0%

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0%

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0% A. 0.5 hertz, 0.5 secondB. 0.5 hertz, 1 secondC. 0.5 hertz, 2 seconds D. 1 hertz, 0.5 secondE. 1 hertz, 1 secondF. 1 hertz, 2 secondsG. 2 hertz, 0.5 secondsH. 2 hertz, 1 secondsI. 2 hertz, 2 seconds

3. a

0%0%0%0%0% A. 1/440 hertz

B. 440 hertzC. 1/440 secondD. 440 seconds E. Correct answer is not listed

3. b

0%0%0%0%0% A. 1/8 hertz

B. 8 hertzC. 1/8 secondD. 8 seconds E. Correct answer is not listed

4a.

0%0%0% A. 1/600 hertz

B. 600 hertzC. Correct answer is not listed

4b.

0%0%0%0% A. 0.567 m

B. 1.76 mC. 204,000 mD. Correct answer is not listed

4b.

ν = λ f340 m/s = λ (600 hertz)Divide both sides by 600…0.567 m

30 cm

The wavelength gets smaller

1 m/s

1 s

1.5 m/s

1 s (same as 6b)

Extra Credit

• 7 clicker questions, each worth +1• Your scores will be calculated and added into

Genesis.

Participant LeadersPoints Participant Points Participant

Today’s Tasks• RETURN CLICKERS• Complete the Math Worksheet• Check in with me anytime you need help /

want clarification / just want to double check

• These questions are all from your text…so I am leaving my text book open if you want to check you work.

• FIX #36 & 40!!! Change them so they match what is in your book!!!–#36: 10 waves, 30 seconds, 5 meters–#40: 20 meters, 10 crests

• Stopping at 11:45 for an exit activity

Open Notes POP Quiz • Normal procedures – phones out and SILENT, no talking, you can

use your notes. DO NOT TELL OTHER CLASSES ABOUT THIS QUIZ.

• When done, take a copy of the EXTRA MATH PRACTICE & begin.1. READ the sample problem on page 1.2. Solve 2 problems (your choice) from #1-5 on loose leaf3. READ the sample problem on page 2.4. Solve 2 problems (your choice) from #6-10 on loose leaf5. READ the sample problem on page 3.6. Solve 1 problem (your choice) from #11-12 on loose leaf7. Solve 1 problem (your choice) from #13-15 on loose leaf12 points – 2 points per problem. SHOW ALL WORK including FORMULAS to get full credit. Feel free to do more than what is assigned for extra practice.(At home…You should also print out the study guide at home in prep. For your May 21/22 test)