- Go over homework questions
- Do demonstrations of different kinds of waves
- Watch brainpop videos on waves, light and refraction, write a paragraph (summary)
- Use ray boxes to show what light does when it goes through lenses
Tuesday, April 27, 2010
The Behavior of Light
Shadows and Reflections (p.96)
1. What evidence do you have that light travels in straight lines?
Light travels in straight lines by traveling in a wave. Light travels through anything ‘transparent’, fastest through vacuum. (Also, the fact that shadows are right behind the object blocking the sun, proves that light travels in straight lines)
2. In the top right hand drawing, imagine that the lamp represents the sun, the cell represents the moon, and the screen is the earth. Make a drawing to show the places on the earth where you would see a partial eclipse and a total eclipse of the sun.
The picture belows top image is a total eclipse and the bottom image is a partial eclipse
3. When light is reflected in a mirror, what is special about the angle of the incident and reflected rays?
The angle of the incident and reflected rays reflected in a mirror become equal to each other
4. Where is the image when you look at something in a mirror?
The image appears to be behind the mirror, when you look at something in a mirror.
5. Light travels in straight lines. If you hide just round a corner so that you can’t see your friends, can they see you?
Sorry, I couldn’t find a way to answer this question…
Reflections by different surfaces (p. 97)
1. What can you see in a completely dark room?
It’s obvious, you can’t see anything, but, sometimes you can figure out some figures.
2. If you place a lamp in this dark room as a light source, explain how you could now see:
a) The lamp: you could see the lamp in a dark room when the lamp is placed as a light source because it is beams of light
b) A piece of white paper: you can see the paper in a dark room when the lamp is placed because papers surface is rough, due to this, when light ‘hits’ paper with various angles the beams goes to different places, and so light becomes reflected from the paper, but scattered beams, not a single beam, therefore we can see the paper
3. What types of mirror could you use for make-up or shaving? What would be the advantages of each type?
When using concave mirrors, you can see a focus point clearly, the image looks bigger, therefore see all pieces of hair when shaving and see smudges or mistakes in make-up.
And when using convex mirrors, they make your face look smaller, and you can see your face in general to see if an opponent can see if you made mistakes in make-up or shaved properly.
4. If a driver has one convex, and one plane rear-view mirror, how would the images in each appear different?
The convex rear mirror would allow you to see closer to the back, but this may confuse the driver, whereas the plane mirror would just allow you to see the normal image, the same size as the actual object or thing.
5. Why could you not use a concave mirror as a rear-view mirror?
You would not use a concave mirror, because rear-view mirrors are supposed to help you see the rear closely, to make it nearer, but concave mirrors make the image look zoomed out, bigger.
6. List as many different uses as you can for plane, convex and concave mirrors
Plane mirrors basically make you see an object as it is exactly, so it would help you to see yourself how tall, fat, thin, short you are.
Convex mirrors help you see closer, therefore you could use it to look at writing you couldn’t read.
Concave mirrors help you see a bigger view, thus it should let you see a full image in a small space of mirror, or the area you’re in.
(I couldn't think of too many so I put it in this format)
1. What evidence do you have that light travels in straight lines?
Light travels in straight lines by traveling in a wave. Light travels through anything ‘transparent’, fastest through vacuum. (Also, the fact that shadows are right behind the object blocking the sun, proves that light travels in straight lines)
2. In the top right hand drawing, imagine that the lamp represents the sun, the cell represents the moon, and the screen is the earth. Make a drawing to show the places on the earth where you would see a partial eclipse and a total eclipse of the sun.
The picture belows top image is a total eclipse and the bottom image is a partial eclipse
3. When light is reflected in a mirror, what is special about the angle of the incident and reflected rays?
The angle of the incident and reflected rays reflected in a mirror become equal to each other
4. Where is the image when you look at something in a mirror?
The image appears to be behind the mirror, when you look at something in a mirror.
5. Light travels in straight lines. If you hide just round a corner so that you can’t see your friends, can they see you?
Sorry, I couldn’t find a way to answer this question…
Reflections by different surfaces (p. 97)
1. What can you see in a completely dark room?
It’s obvious, you can’t see anything, but, sometimes you can figure out some figures.
2. If you place a lamp in this dark room as a light source, explain how you could now see:
a) The lamp: you could see the lamp in a dark room when the lamp is placed as a light source because it is beams of light
b) A piece of white paper: you can see the paper in a dark room when the lamp is placed because papers surface is rough, due to this, when light ‘hits’ paper with various angles the beams goes to different places, and so light becomes reflected from the paper, but scattered beams, not a single beam, therefore we can see the paper
3. What types of mirror could you use for make-up or shaving? What would be the advantages of each type?
When using concave mirrors, you can see a focus point clearly, the image looks bigger, therefore see all pieces of hair when shaving and see smudges or mistakes in make-up.
And when using convex mirrors, they make your face look smaller, and you can see your face in general to see if an opponent can see if you made mistakes in make-up or shaved properly.
4. If a driver has one convex, and one plane rear-view mirror, how would the images in each appear different?
The convex rear mirror would allow you to see closer to the back, but this may confuse the driver, whereas the plane mirror would just allow you to see the normal image, the same size as the actual object or thing.
5. Why could you not use a concave mirror as a rear-view mirror?
You would not use a concave mirror, because rear-view mirrors are supposed to help you see the rear closely, to make it nearer, but concave mirrors make the image look zoomed out, bigger.
6. List as many different uses as you can for plane, convex and concave mirrors
Plane mirrors basically make you see an object as it is exactly, so it would help you to see yourself how tall, fat, thin, short you are.
Convex mirrors help you see closer, therefore you could use it to look at writing you couldn’t read.
Concave mirrors help you see a bigger view, thus it should let you see a full image in a small space of mirror, or the area you’re in.
(I couldn't think of too many so I put it in this format)
Thursday, April 22, 2010
Agenda 22/04/2010
- Review all your past Labs. Put together your portfolio
- Prepare a lab help sheet to get ready for your lab write up on Monday
- Prepare a lab help sheet to get ready for your lab write up on Monday
Tuesday, April 20, 2010
Monday, April 19, 2010
Agenda 19/02/2010
- Check homework
- Discuss Iceland volcano
- Explain how eyes work
- Investigate different types of animal eyes post on blog
- Discuss Iceland volcano
- Explain how eyes work
- Investigate different types of animal eyes post on blog
Agendas...
My computer had to get re-formatted because it wouldn't turn on, and before I could post them, they got erased... I'm so sorry, I know it was my responsibility. I'll try my best to get all of them from now on at least.
Thursday, April 15, 2010
Pinhole Camera Experiment
Sorry sir, I couldn't answer some of the questions because I hadn't tried the experiments, and 1 I think I didn't understand. And it says 15th of April because I typed the Title and made this post then, (But I didn't answer all the questions then ), I just hadn't published it.
Experiment 1
WHAT TO DO
Collect the pin-hole camera and make a small hole with the pin in the black paper. Hold the camera about 3m from the window and look through the camera at the lamp
You should see and image of the lamp on the tracing paper screen. Write down what the window looks like. Is it:
a) Upside down or the right way up? it is upside down
b) In color or black and white? it is black and white
c) The same size as the window itself or not? no it was way smaller
Experiment 2
WHAT TO DO
Change the distance of the pin-hole camera from the window.
How does this affect:
a) The size of the image?
b) How clear the image is?
Experiment 3
WHAT TO DO
Make another pinhole about 1 cm from the first one
Describe what you see below.
Didn't do this.
Experiment 4
WHAT TO DO
Make ONE of the pin-holes bigger using a pencil point.
What affect does it have on:
a) How bright the image is? it gets brighter the bigger the hole is
b) How clear the image is? it gets blurrier the bigger the hole is
b) How big the image is? it gets bigger as the hole gets bigger
Experiment 5
WHAT TO DO
Take off the black paper and stick a lens over the hole in the cardboard, INSIDE the box. Repeat experiments 1 and 2 using the lens. Didn't do this.
Experiment 6
WHAT TO DO
1. Look at the windows through the pin-hole camera especially if it is a sunny day. Didn't try this.
2. Sit someone in the beam of the projector and look at them with the pinhole camera. A: the person sitting was seen on the top of the pinhole camera, the pictures turns upside down when projected
3. Try lenses with different focal lengths (large or small curvatures). Didn't try this.
QUESTIONS
1. Why was the inside of you camera painted black?
2. Why was the light shield used?
3. Why was the image so much better with a lens?
FOLLOW UP TOPICS
1. Try to take an actual photograph with your pin-hole camera
2. Draw ray diagrams to show how the image is formed on the tracing paper screen
Experiment 1
WHAT TO DO
Collect the pin-hole camera and make a small hole with the pin in the black paper. Hold the camera about 3m from the window and look through the camera at the lamp
You should see and image of the lamp on the tracing paper screen. Write down what the window looks like. Is it:
a) Upside down or the right way up? it is upside down
b) In color or black and white? it is black and white
c) The same size as the window itself or not? no it was way smaller
Experiment 2
WHAT TO DO
Change the distance of the pin-hole camera from the window.
How does this affect:
a) The size of the image?
b) How clear the image is?
Experiment 3
WHAT TO DO
Make another pinhole about 1 cm from the first one
Describe what you see below.
Didn't do this.
Experiment 4
WHAT TO DO
Make ONE of the pin-holes bigger using a pencil point.
What affect does it have on:
a) How bright the image is? it gets brighter the bigger the hole is
b) How clear the image is? it gets blurrier the bigger the hole is
b) How big the image is? it gets bigger as the hole gets bigger
Experiment 5
WHAT TO DO
Take off the black paper and stick a lens over the hole in the cardboard, INSIDE the box. Repeat experiments 1 and 2 using the lens. Didn't do this.
Experiment 6
WHAT TO DO
1. Look at the windows through the pin-hole camera especially if it is a sunny day. Didn't try this.
2. Sit someone in the beam of the projector and look at them with the pinhole camera. A: the person sitting was seen on the top of the pinhole camera, the pictures turns upside down when projected
3. Try lenses with different focal lengths (large or small curvatures). Didn't try this.
QUESTIONS
1. Why was the inside of you camera painted black?
2. Why was the light shield used?
3. Why was the image so much better with a lens?
FOLLOW UP TOPICS
1. Try to take an actual photograph with your pin-hole camera
2. Draw ray diagrams to show how the image is formed on the tracing paper screen
Monday, April 12, 2010
How can you improve your MYP grade next term?
I need to get a higher mark on criteria D especially. I did get a seven for term 1 and probably 2 from what I counted in average, and I'm really happy, but I barely made it into the 7 area. So, I think the next criteria D or B I think?, I should try my best to get full marks. This year it counts last term and this terms as well, which is what makes it harder, but also easier. That is because if you get one grade bad it could effect you for the whole year, yet if you normally not get a 6 and you got one in the first term or something, it could higher your grade. So for criteria D i got a 4 and that effected criteria D a lot. What I can do myself, is to try my best, and review daily, so I can remember all information to the fullest. Knowing information helps because at the time of a test or whatever, if I know the information, I can think of a way to use it to support my statements or thoughts.
Agenda: 02/02/2010
• Show petri plates bread mold (discuss lab write up)
• Show where students get information to revise from
• Discuss differences between bacteria and viruses (how they cause diseases)
Homework: practice lab report
• Show where students get information to revise from
• Discuss differences between bacteria and viruses (how they cause diseases)
Homework: practice lab report
Tuesday, April 6, 2010
Hypothesis for Scientist Dr. Edward Paginilli's Experiment
"My hypothesis is that the tongue has specific regions that only can taste sweet, bitter, sour, and salty."
I agree to this hypothesis because when I did the experiment with the vinegar, sugar, salt, and black coffee, I seemed to taste stronger tastes on the different bits of the tongue for each flavor. Although I couldn’t taste it that well in general for some of the things I could taste, I tasted it more strongly on a certain bit of the tongue, than overall. Even though I did taste it more on the certain places, you could still taste it on other places, I believe there’s not only one particular part that you can taste the sweetness, or saltiness etc. So I believe the hypothesis above is correct but incorrect.
I agree to this hypothesis because when I did the experiment with the vinegar, sugar, salt, and black coffee, I seemed to taste stronger tastes on the different bits of the tongue for each flavor. Although I couldn’t taste it that well in general for some of the things I could taste, I tasted it more strongly on a certain bit of the tongue, than overall. Even though I did taste it more on the certain places, you could still taste it on other places, I believe there’s not only one particular part that you can taste the sweetness, or saltiness etc. So I believe the hypothesis above is correct but incorrect.
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