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Physical Science boo
Light and stuff..
| Question | Answer |
|---|---|
| What is meant by the dual nature of light? | Light is both a particle and a wave |
| How does light behave as a wave? | Instead of being stopped by solid objects, it bends around them somewhat |
| How does light behave as a particle? | It can travel through a vacuum, despite the fact that it does not have a medium through which to travel |
| What kind of wave would a light be? | Transverse |
| Describe electromagnetic waves? | An electric wave and a magnetic wave oscillating perpendicular to one another |
| What is the name of the theory that scientists use to explain the dual nature of light? | Quantum-mechanical theory |
| What is a photon? | Small packet of light |
| How fast does light travel in a vacuum? | 670,000,000 MPH |
| Why does sound travel fastest in solids? | Because sound is only a wave, it need a medium in which to oscillate. The closer the particles of the medium, the faster the wave energy can be transferred. |
| Why does light travel fastest in gases? | Light, on the other hand, has a particle and wave nature. The particle aspect travels fastest when it has room to move. Therefore, a gas in an easier medium(or vacuum) for light to travel through |
| To what does the wavelength of light correlate? | The color( or how much it bends in a particular medium.) |
| Do we see all wavelengths of light? Explain. | No, our eyes only detect a small porportion of the electromagnetic spectrum(what we call light). Some insects can see ultraviolet and infrared light. |
| How does a microwave heat food quickly? | The wavelength of light given off by a microwave excites water molecules. This causes them to spin, which creates friction between the molecules of water and the molecules of food. Friction = heat. |
| Even though radio waves are really light waves, why doesn't a radio antenna glow when picking up a signal? Why don't you glow when you get an x-ray? | Your eyes cannot see that part of the electromagnetic spectrum |
| State the Law of Reflection and tell how we demonstrated it in class? | Law of Reflection- the angle of reflection is equal to the angle of incidence to the angle of reflection. |
| How does the sun compare in size to most other stars? | It is fairly large. |
| Of what is the sun mainly composed? | 74% Hydrogen 25% Helium |
| The four regions of the sun: The Core- | where nuclear fusion takes place; two hydrogen nuclei are fused to produce a helium nuclei. There is a loss of matter as it is converted to energy. That energy heats the sun and produces light. |
| The raduative zone- | Photons produced in the core move into the less densley packed radiative zone. |
| Convection zone- | Photons leave radiative zone and enter the convective zone, where they heat gases and cause them to rise and "bubble". The surface of the convection zone is the photosphere |
| Photosphere- | This is the only part of the sun we see. Gases from the convection zone transfer energy to gases in the photosphere. As gases rise to the top of the photosphere, they release a large amount of energy in the form of electromagnetic waves. |
| What greatly affects the photosphere and probably causes the dark spots and bright spots on the sun? | The sun's magnetic field |
| What results from solar flares? | Enormous ammounts of the radiation are sent toward the earth. It interrupts satelight communications, radio signals and power grids. |
| What is nuclear fusion? | the process by which two small nuclei fuse to make a bigger nucleas |
| What is nuclear fission? | the process by which a large nucleas is split into two small nuclei. |
| what is critical mass? | the ammount of isotopes necessary to maintain a chain reaction. |
| What would happen in a nuclear fission reaction where there was significantly more than critical mass to sustain a chain reactioln? | An explosion would occur. |
| Why don't nuclear plants explode? | There is not significantly more than critical mass. |
| What can be a dangerous result from the reaction in a nuclear power plant, and why is it dangerous? | A meltdown; It can cause everything it the vicinity of the power plant to melt, which can cause radioactive isotopes to be released into surrounding areas. |
| What is another danger of nuclear energy? | The by-products are radioactive. |
| What are some advantages to nuclear energy? | It is cheap, it produces large ammounts of energy, it results in overall fewer deaths than other forms of energy production |
| Why don't we use nuclear fusion as a means of producing electricity? | Don't have the technology to make it feasible |
| To what does a star's color genertally relate? | It's temperture. |
Created by:
taylorgang
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