Physical Science

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I need help with some of these questions:

1.If you look at a red leaf, what describes what happens when you see it?
A.The leaf absorbs red light from our eyes
B.Our eyes reflect red light back to the leaf
C.Red light reflected from the leaf enters our eyes
D.The leaf radiates all colors of light except red to our eyes
C...?

2.Which of these objects would have the following characteristics: reflects a lot of light, absorbs a little light, and transmits almost no light?
A.drop of water
B.glass of orange juice
C.lump of coal
D.marshmallow
I think it can either b C or D

3.Which best describes the light that plants transform into chemical energy by the process of photosynthesis?
A.green light
B.infrared light
C.ultraviolet light
D.red and blue light
Not sure about this one...D---??

4.What happens when light strikes the retina in our eyes?
A.Optic fibers send light to the brain
B.An image is protected on the lens of the eye
C.Light sensitive cells send impulses to the brain
D.Chemicals react to develop a photographic image
Not sure about this one either...C?

Thanks!
-MC

  • Physical Science -

    1C, 2D, 3D, 4C
    You misspelled "projected" in 4B, but it's wrong anyway.
    A glass of orange juice absorbs a lot of light - about half, depending upon wavelength.

  • Physical Science -

    1.If you look at a red leaf, what describes what happens when you see it?
    A.The leaf absorbs red light from our eyes
    B.Our eyes reflect red light back to the leaf
    C.Red light reflected from the leaf enters our eyes
    D.The leaf radiates all colors of light except red to our eyes
    C...?
    I agree

    2.Which of these objects would have the following characteristics: reflects a lot of light, absorbs a little light, and transmits almost no light?
    A.drop of water
    B.glass of orange juice
    C.lump of coal
    D.marshmallow
    I think it can either b C or D
    I would go with D

    3.Which best describes the light that plants transform into chemical energy by the process of photosynthesis?
    A.green light
    B.infrared light
    C.ultraviolet light
    D.red and blue light
    Not sure about this one...D---??
    The answer here is sunlight but since that isn't available in the set of answers, I would go with ultraviolet radiation
    4.What happens when light strikes the retina in our eyes?
    A.Optic fibers send light to the brain
    B.An image is protected on the lens of the eye
    C.Light sensitive cells send impulses to the brain
    D.Chemicals react to develop a photographic image
    Not sure about this one either...C?
    I would go with C also, although the way it works is that there is a chemical process that initiates the impulse to the brain which makes one take a second look at D before picking C.

  • Physical Science -

    Thanks to both of you!
    -MC

  • Physical Science [DRBOB22 PLEASE CHECK] -

    Btw Dr.Bob, the answer to #3 is actually D, what I drwls and I said. Just letting you know ;)
    -MC

  • Physical Science -

    You're right, at least according to most of the sources I can read after seeing the response by DrWLS. But I didn't think red and blue light had enough energy to induce photosynthesis which is why I went with UV. In chemistry we usually write a chemical equation like this.
    A + B + energy ==> C + D
    Then because we are lazy we write h(greek letter nu) for energy. And in chemistry, hnu almost ALWAYS means UV energy and not just plain energy. But I defer to the answers you and DrWLS provided.

  • To MC -

    Now, I have a follow up question. If you knew the answers, why were you posting the questions in the first place with notes that you weren't quite sure about this and that?

  • Physical Science -

    I didn't know the answer. I submitted them to my teachers as soon as i got confirmation that they were correct and she lets me know which ones I got wrong
    -MC

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