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Physics ch 9-8
Capter 9-8
| Question | Answer |
|---|---|
| Ideal shape of telescope s primary mirror | Convex mirror |
| Mirrors use this | Specular reflection |
| Makes used of crossed polaroids | Liquid crystal display |
| What keepsna light Ray inside an optical fibber | Total internal reflection |
| Occurs when light passes through a very narrow slit | Diffraction |
| Occurs when twonloght waves arrive at a point out of phase | Destructive interference |
| It is half silvered | One way mirror |
| Lens that is thicker at the center | Converging |
| The image height divided by the object height | Magnification |
| Occurs because the speed of light bin a transparent substance is frequency dependent | Dispersion |
| Type of image seen projectedbonto a screen | Real |
| You can see your image in a mirror because of | Specular reflection |
| You do not see your image when you look at a flatbrough aluminium surface because of | Diffuse reflection |
| What is meant by normal surface | A line perpendicular to the surface at a given point |
| Liquid crystal displays make use of | Diffuse reflection |
| The colors of objects we see by reflected light are due to | Selective absorption |
| Light spreads out when it passes through a narrow slit because of | Diffraction |
| When light passes through two or more narrow slits, an alternating dark and bright pattern is observed on a screen because of | Interference and diffraction |
| Certain types of sunglasses are very effective at diminishing light reflected from surfaces because of | Polarization |
| According to the law of refection, a light Ray strinking a mirror at an angle of incidence of 30 degrees will leaves the mirror at the angle of | 30 degrees |
| Optical fibbers work because of | Total internal reflection |
| You see colors in a rainbow because of | Dispersion |
| A light Ray bends when it goes from one medium to anotherbbecause of | Refraction |
| When a light Ray travelling in air meetsnthe surface of a piece of glass, which of the followingboccur at the interface | Some of the light is reflectedbback into the air/ some of the light enters the glassnand is refracted toward the normal |
| When you look into pool of water, the depth looks less than it actually is because of | Refraction |
| You see colors with a prism because of | Dispersion |
| Rank the following media in order according to the spednof light in them, from slowest to fastest | Glass, water, air, vacuum |
| The sky is blue because of | Scattering |
| The primary mirror in an astronomical telescope must be a | Concave mirror |
| Snew telescopes are using adaptive optics. What is that? | Continually adjusting the mirror s shape during observation |
| What is meant by term plane mirror | A flat mirror |
| Parallel light rays from a distant object strike the surface of a concave mirror. After reflecting from the mirror s surface, the rays will converge at | The mirrors focal point |
| What makes pink ink pink | Selective absorption |
| You look at your self in a plane mirror. If you move away from the mirror and look at yourself again, you now see | A smaller image of your self |
| The type of mirror that will allow you to see large areas normally hidden from your view is | Convex |
| Image height divided by object height gives | Magnification |
| a person looking through eyeglasses sees | Virtual images |
| A lens that os thicker at the center than the edges | Is a converging lens |
| A lens that is thinner at the centre than the edges | Is a diverging lens |
| An image seen projected on a secret by a single Ense | Is always inverted or is a real image |
| A nanometer is | One billionth of a meter |
| Of EM waves having these wavelengths which would be visible | 500nm |
| Two otherwise identical light waves arriving at the same point with peak matching valley undergo | Constructive interference and destructive interference |
| The fact that light can be polarised shows that light is | A transverse wave |
| What is an isotope | An atom of an element with a different number of neutrons in the nucleus |
| The number of the protons in a nucleus is the | Atomic number |
| Two isotopes have the same | Atomic number |
| How do isotopes of a given element differ | They have different mass numbers and neutron numbers |
| How big is the nucleus of an atom | About a trillionth of the volume of the whole atom |
| What jolts the nucleus together | Strong forces |
| The expression idicates the atomic number of a nucleus is | Z |
| The expression indicating the number of protons in a nucleus is | Z |
| The expression indicating the mass number of a nucleus | Z+N |
| The expression indicating the number of nucleons in a nucleus is | Z+N |
| The expression indicating the number of neutrons in a nucleus is | A-Z or B |
| what does the 235 represents in uranium -235 | the mass number |
| an alpha particle is another name for a | hellium nucleus |
| a beta particle is another name for a | electron |
| how can an electron be ejected from a nucleus in beta decay if it wasn't in the nucleus to begin with | a neutron in the nucleus turns into a proton, electron and a neutrino |
| a gamma ray is another name for | photon |
| low levels of ionizing radiation | can be tolerated by the human body |
| why is nuclear reactor waste radioactive | used fuel rods contain fission fragments which are radioactive |
| why is there radioactive source in a smoke detector | it ionizes the air |
| what is decay chain | one radioisotope decaying into another, which decays into another and so on |
| when a neutron decays to create a proton, another particle emitted is a | beta particle |
| when a nucleus is an excited state decays to the ground state, the particle emitted is a | gamma ray |
| the time interval during which nucleus has a 50% probability provided by | radioisotope thermoelectric generators |
| carbon-14 can be used to find the age of material up to | tens of thousands |
| the hydrogen in the universe was formed by | the energy of the Bing Bang |
| the splitting of a large nucleus into two smaller nuclei upon absorbing a neutron is | nuclear fission |
| the combining of two nuclei to form a larger nucleus with the release of energy is | nuclear fusion |
| fission is used in | atomic bombs and power plants |
| fusion is used in | energy for stars ans hydrogen bombs |
| magnetic confinement is used in controlled fusion experiments to | control a plasma |
Created by:
nihanbjk