Science Classroom Connection

Students: We’ve had 12 A’s and 19 B’s and a whole bunch of C’s on the ISN test. This means the study guide that you were given last Friday for Wednesday Unit Test needed to be completed by past this weekend, in order for you to be better prepared for the unit test on Wednesday, May 15, 2019.

The unit test encompasses everything that we have studied on light and its characteristics. The study guide is very comprehensive. If you learn it, then you should be able to earn an “A” on the unit test this coming Wednesday!

Unit 4 Test Study Guide

Vocabulary

(You should be able to define with words, match a picture, and give examples)

Reflect

Refract

Absorb

Emit

Incident Light

Law of Reflection

Scattering

Transmit

Fiber Optics

Photon

Concave Mirrors

Convex Mirrors

Concave Lenses

Convex Lenses

Frequency

Wavelength (λ)

Amplitude

Metamaterials

Negative refraction

Focal point

Electromagnetic spectrum

Roy G. Biv

Radiation

Internal reflection

Transparent

Translucent

Opaque

Chromatic aberration: *The material effect produced by the refraction of different wavelengths of electromagnetic radiation through slightly different angles, resulting in a failure to focus. It causes colored fringes in the images produced by uncorrected lenses.

*Source: Google search engine

Concepts

1. Light acts as both a _____________ and a _________________
2. Give an example of natural light and artificial light
3. Light travels the fastest in _________________. Explain why.
4. How do we see? Use at least 4 vocabulary words
5. What is metamaterial? How does it work? How can we use it?
6. What can color tell us?
7. A light’s color depends most on its __________
8. How are different types of radiation arranged along the electromagnetic spectrum?
9. What do all forms of electromagnetic radiation have in common?
10. How is mixing the primary pigment colors together different from mixing the primary colors of light together?
11. In which situation would the person most likely see a rainbow?
12. How is wavelength related to energy?
    If the wavelength is long, then the energy is ______
    If the wavelength is short, then the energy is ______
13.  What makes each light color bend differently?
    If the wavelength is long, then it bends at a ____ angle
    If the wavelength is short, then it bends at a ____ angle
14.  How is the color of the rainbow related to its energy?
    The color with the most energy is ______
    The color with the least energy is ______
15. How do scientists use color to determine how hot a star is?
    Blue stars are the ___________
    Red stars are the __________
16. Give an example of how we use the following types of rays:

1. 1. Radio waves
   2. Microwaves
   3. Infrared waves
   4. Ultraviolet waves
   5. X-ray waves
   6. Gamma ray waves

17. Relationship between wavelength and frequency

As the wavelength increases the frequency ____________

As the wavelength decreases the frequency ___________

18. Relationship between frequency and energy

As the frequency increases the energy ___________

As the frequency decreases the energy ___________

19. Label all the parts of a wave

20. Use the triangle to calculate speed (m/s), wavelength (λ called lambda and measured in m), and frequency (Hz, use 1/sec in your calculations).

EC. Make connections about how a mirrors and lenses are alike

*BASIS FOR COMPARISON	CONVEX MIRROR	CONCAVE MIRROR
Meaning	Convex mirror implies the mirror whose reflecting surface is away from the center of curvature.	Concave mirror refers to the mirror whose reflecting surface is towards the center of curvature.
Shape
Center of curvature	Lies behind the mirror	Lies in front of the mirror
Type	Diverging mirror	Converging mirror
Image	Virtual image is formed.	Real or virtual image is formed.
Used as	Rear view mirrors in cars and bikes.	Reflectors in projectors, searchlights etc.

**BASIS FOR COMPARISON	CONVEX LENS	CONCAVE LENS
Meaning	Convex lens refers to the lens which merges the light rays at a particular point, that travels through it.	Concave lens can be identified as the lens which disperses the light rays around, that hits the lenses.
Figure
Curve	Outward	Inward
Light	Converges	Diverges
Center and edges	Thicker at the center, as compared to its edges.	Thinner at the center as compared to its edges.
Focal length	Positive	Negative

*Source: https://keydifferences.com/difference-between-convex-and-concave-mirror.html

**Source: https://keydifferences.com/difference-between-convex-and-concave-lens.html

Students will be evaluated upon the meaning and characteristics of the 5 different types of light ray diagrams and should be able to give an example upon each, namely, reflection, refraction, scattering, absorption, and transmission,  as well as all aspects of our study of light in terms of mirrors and lenses through their documentations in students’ interactive notebooks.

Your test scores on Calculations with Waves have been corrected and posted. Congratulations to many of you who have delivered.

Now, there seems to be a number of students who have attempted to cheat themselves out of an education by getting the answers from other students in other sections, and began playing around with the numbers on the test to achieve the same answer(s) that was given to them by these misguided friends of theirs. What these students have apparently forgotten is that the work has to make sense to arrive at the proper values, and furthermore, many of them may have slip their minds who their classroom teacher is! Been there, done that! Nice try! 

On a side note, the Science Department at Woodworth Middle School has decided to convert the recent lab activity on light behavior from a formative assessment to a summative assessment. Thus, this means the lab activity has impacted your overall grade in the class, thus far, for this marking period.

Students will have an opportunity to display their mathematical skills in determining the relationship among the variables of a wave in terms of its wavelength, frequency, and velocity through various instances, as a summative evaluation.

In case that you feel that you need more practice here is a website with a list of problems!

1. A wave with a frequency of 14 Hz has a wavelength of 3 meters. At what speed will this wave travel?

2. The speed of a wave is 65 m/sec. If the wavelength of the wave is 0.8 meters, what is the frequency of the wave?

3. A wave has a frequency of 46 Hz and a wavelength of 1.7 meters. What is the speed of this wave?

4. A wave traveling at 230 m/sec has a wavelength of 2.1 meters. What is the frequency of this wave?

5. A wave with a frequency of 500 Hz is traveling at a speed of 200 m/s. What is the wavelength?

 6. A wave has a frequency of 540 Hz and is traveling at 340 m/s. What is its wavelength?

7. A wave has a wavelength of 125 meters is moving at a speed of 20 m/s. What is it’s frequency?

8. A wave has a frequency of 900 Hz and a wavelength of 200 m. At what speed is this wave traveling?

9. A wave has a wavelength of 0.5 meters and a frequency of 120 Hz. What is the wave’s speed?

10. Radio waves travel at a speed of 300,000,000 m/s. WFNX broadcasts radio waves at a frequency of 101,700,000 Hertz. What is the wavelength of WFNX’s radio waves?

Create a foldable with the following terms and their definitions on light:

Students: Since we spent most of our class period on Monday, today, solving and practicing on describing and measuring waves, you need to do some catch-up work on your reading comprehension on light, due to the fact that last week, on Friday, you missed most of your 5th hour, as the school celebrated, “Care to the Core” event.

Make sure that when you come in on Tuesday that you have completed the reading assignment and answered the accompanied series of short-answer questions in the margins given on the handout article.

Thinking Ahead and Planning Accordingly: Yes, the classroom teacher realizes that you will also have other schoolwork for your other classes, as well. But, remember that you do not want your class period to be continuously behind other class periods on a daily basis, and you end up eventually losing on the normal unit test review in class.

Do the following 3 problems on the back of the sheet that we did in class today titled, “Calculations with Waves Worksheet”.

1. What is the frequency of the wave that has a wavelength of 30 m and a speed of             120 m/s?
2. If a wave has a wavelength of 48 m and a frequency of 8 Hz, then what is its speed?
3. What is the wavelength of a wave that has a frequency of 12 Hz and a speed of               60 m/s?

Students: Even though tomorrow some of you are scheduled to be attending “Care to the Core” event in the Gym after 12:30 pm, you are still expected to do your homework assignment on describing and measuring waves based on our class discussion earlier today, Thursday.

Avoid ignoring the work, since it has been decided that next Wednesday, May 01, 2019, we will be having a summative evaluation on this very topic. Therefore, practice, practice, practice, and you will be the winner for it at the end. Make sure that you understand the variables based on their units of measurements, since it is the units that will determine and tell you if you really understand the material. Simply memorizing the units for their variables can lead you to make careless mistakes on the evaluation next week.

Tomorrow, in class, a few of you will be asked to come up to the board and walk your classmates and the classroom teacher through various instances of the problem-solving process on describing and measuring waves.