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Light + Sound Waves: Physics Final Sem 1 Study Guide 2018
Terms in this set (19)
Why is it that we see lightning before we hear thunder even though they are created at the same time?
The speed of light is significantly greater than that of sound
What is the importance of the Cochlea of the ear?
To interpret incoming sound waves
How do we pick up light and interpret what we see from that light?
The pupil changes based on the amount of light
Light travels to the retina
Photoreceptors called rods and cones interpret the light
Messages are sent via the optic nerve to the brain
The red and blue lights from your TV mix together to form _________ which is a result of the ______ color process
What COLOR would be transmitted if yellow light shined through a blue filter?
Why do photosynthetic organisms appear green when the sun shines on them?
White light containing ALL of the colors the eye interprets strikes the plant, where red and blue energies of the light are absorbed
Green is reflected to our eyes
How is the color orange created in your eye?
Green and red light are reflected back to our eyes with an imbalance favoring red
Why does a glowstick 'glow'?
An exothermic reaction is created by combining two chemicals, one of which is a dye that determines the color of the glow stick. The reaction releases energy in the form of light, which is why it glows, as well as some heat
If two balloons have the same net charge and are placed near one another, what will occur?
They will repel
What occurs when an object gains a net charge by friction of two surfaces rubbed together? In other words, where does the charge come from?
The relocation of electrons
Which of the materials below would be considered a conductor of electric current?
Plastic straw b. Styrofoam cup c. A Nail d. Wood e. Paper
What is the unit of charge measured in?
If material A loses electrons due to friction with material B, which of the following is ALWAYS true?
Object B gained that same amount of electrons due to conservation of charge
What is polarization?
Polarization occurs when an electric field distorts the negative cloud of electrons around positive atomic nuclei in a direction opposite the field. This slight separation of charge makes one side of the atom somewhat positive and the opposite side somewhat negative.
If you rub a balloon on your shirt and place it near a wall, it 'sticks' because:
The negative charge of the balloon repels the negative particles within the atoms in the wall when placed near. It is attracted to the 'oppositely' charged surface using electrostatic forces
You walk across the room on a cold, dry, winter day while dragging your feet on carpet. You then touch a light switch and hear and feel a 'zap'. What is this process called and what is your Net Charge after touching the light switch?
c. Grounding; no charge
In terms of Coulomb's Law, what occurs as oppositely charged particles are placed further from one another?
The repelling force decreases proportionally
A +1.0 C charged object is placed at a distance from a -2.0 C charged object. The force between the objects is 10 Newton. What is the force at twice the distance? (k=9 x 109 Nm2/C2)
If you were to place a negatively charged object near the metal rod at the top of the electroscope, why do the leaves move apart?
Electrons are forced down into the foil where they repel one another due to having a like charge
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