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Physics Final
| Question | Answer |
|---|---|
| Anna wears glasses that make her eyes look smaller than they actually are. These glasses are... | for correcting nearsightedness. |
| Which is the correct order of EM radiation, from highest to lowest frequency? | gamma, ultraviolet, visible, infrared, radio |
| What is blackbody radiation? | The heat emitted by a warm body |
| What is a main component of sunscreens? | TiO2 |
| For general knowledge: You may search online. What are the pillars of the nuclear agreement between Iran and the United Nations? | Limitation on the number of centrifuges and limitation on the degree of U enrichment |
| What makes something radioactive? | an unstable nucleus |
| Which of the following events would expose you to the most radiation? | getting a CT scan of your chest |
| Which of the following typically poses the biggest health threat to humans? | alpha particles, beta particles, and gamma rays all pose threats , it depends on the situation in question |
| Which of the following household items might contain radioactive material? | smoke detectors |
| Who was the first person to discover radioactivity? | Henri Becquerel |
| How many nuclear power plants are there worldwide? | several hundred |
| What does the United States currently do with high-level nuclear waste generated from nuclear power plants? | keeps the waste at the site where it's generated |
| true statements about FISSION | Releases large amounts of energy, the splitting of atom, requires a single neutron to start the reaction, and releases large amounts of energy |
| What is a disadvantage of fission? | The products are radioactive |
| Choose all the places where fusion occurs naturally | the sun |
| What is required to make fusion reactions to work? | high pressure and high temperature |
| Which reaction do nuclear power plants use because it is easier to accomplish? | fission |
| Fission means to | break apart |
| What are the benefits of fission and fusion? | they both release large amounts of energy |
| CT stands for Complex Tomography | False; CT stands for Computed Tomography |
| X rays are made of the same “stuff” as visible light. They are both forms of “electromagnetic waves” | True |
| X rays were discovered completely by accident during a physics experiment | True |
| X rays can damage healthy tissues | True |
| With CT scans the patient receives a lower dose of x rays than with a standard X ray machine | False |
| What types of imaging techniques do not expose people to X-ray radiation? | PET, MRI, and MEG scanners |
| Which material stops X-rays dead in their tracks, preventing unnecessary exposure to radiation? | lead |
| What happens when an X-ray beam is turned off? | Turning an X-ray machine off leaves the area free of radiation |
| What is light? | a form of energy that travels in waves |
| Compared to red light, the wavelength of green light is | shorter |
| Which has a high frequency than visible light? | X-rays, gamma rays, ultraviolet radiation |
| The speed of light in a vacuum is | greater than the speed of light in glass |
| To save on electricity and eliminate heat in the kitchen, you would like to build a solar cooker. Which type of mirror would work best? | concave mirror |
| In people who are nearsighted, the lens in their eye focuses the image in front of the retina. Do nearsighted people need glasses with converging lenses or diverging lenses? | Diverging |
| Mirrors _____ light rays to make an image | Reflect |
| If an object absorbs light in all wavelengths, what color does it appear to be? | Black |
| The number of waves that pass by in a second is known as the wave's? | Frequency |
| The distance between two identical points on a wave is the wave's | Wavelength |
| The material a wave travels through is called the | Medium |
| If you are standing 2 feet from a plane mirror and looking into it, the image you see will be ___ feet away from the mirror on the other side. | 2 feet |
| Sound waves are | longitudinal waves |
| Pitch is related to what physical characteristics of a wave? | Frequency |
| Electromagnetic waves | travel at the same speed in a vacuum regardless of wavelength |
| In a vacuum the speed of light waves compared to the speed of radio waves is | the same |
| Your car rearview mirror states "OBJECTS IN THIS MIRROR ARE CLOSER THAN THEY APPEAR." The mirror is | convex |
| A ray of light is incident on a plane mirror and the angle of incidence is 15 degrees. What is the angle of reflection? | equal to 15 degrees |
| Which answer explains why no sunlight gets into the cave chamber? | the light cannot get round the wiggles in the tunnel |
| Which pairs of colors of pigment combine to make black? | green, magenta, red, cyan, yellow, and blue |
| If a seagull sitting in water bobs up and down once every 2 s and the distance between two crests of the water wave is 3 m, what is the velocity of the wave? | 1.5 m/s |
| A boat in the trough of a wave takes 3 s to reach the highest point of the wave. The velocity of the wave is 5 m/s. | 30m |
| Anna wears glasses that make her eyes look larger than they actually are. These glasses are | for correcting farsightedness |
| A _____ uses 2 convex lenses to magnify an object and make a smaller object larger. | microscope |
| A car is moving along the positive x-axis with a speed of 20 m/s. 5 seconds later the car is moving at 10 m/s in the same direction. The car's acceleration is | -2 m/s^2 |
| A car is moving along the positive x-axis with a speed of 20 m/s. 5 seconds later the car is moving at 10 m/s in the same direction. The magnitude of the car's acceleration is | +2 m/s^2 |
| A negative coordinate implies that an on object is | On the negative side of the origin |
| Which one of the following units can be used to measure the speed of an object? | miles per hour, meters per second |
| The position of a submarine is an example of | a three-dimensional system |
| An object is moving along the positive direction with a velocity of 30 m/s. 2 seconds later, the object is moving with a velocity of 20 m/s in the same direction. What is the magnitude of its acceleration. | 5 m/s^2 |
| A car goes from 0 m/s to 10 m/s in 4 seconds, moving along the positive x-axis. What is its acceleration? | 2.5 m/s^2 |
| A car is moving towards the west with a velocity of 50 m/s. 5 seconds later, the car is moving at 10 m/s to the east. What is the car's acceleration? | -12 m/s^2 west or 12 m/s^2 east |
| what is the acceleration of the highest point of its trajectory for an object thrown straight up in a vacuum? | 10 m/s^2 downward |
| In the physics world, (no air) Suppose that an object is thrown upwards at a speed of 60 m/s. How long will it take to reach back to the starting point? Assume the gravitational acceleration is 10 m/s^2 downward | 12 seconds |
| In the physics world, (no air) Suppose that an object is thrown upwards at a speed of 60 m/s. What would be the velocity of the object after 8 seconds? Assume the gravitational acceleration is 10 m/s^2 downward | 20 m/s downward |
| In a physics world, (no air, so no wind), Suppose that an object is thrown upwards at a speed of 60 m/s standing up on a mountain cliff. What would be the velocity of the object after 15 seconds? Assume the gravitational acceleration is 10 m/s^2 downward | 90 m/s downward |
| In the absence of wind, Which angle should the shot put should be thrown by an athlete to achieve the farthest distance of throw? | 45 degrees |
| In projectile motion which of the following launch angle provides the longest fly time for identical objects thrown with the same speed? | 70 degrees |
| Which is stronger, the Earth's pull on the Sun or the Sun's pull on the Earth? | The forces are the same size |
| An object can become positively charged by | losing electrons |
| You have a circuit with a resistance of 10 Ohm. A current of 2A flows through it. What is the voltage? | 20 V |
| If 1 coulomb of charge flows through a wire in 10 seconds, the current in the wire is | 0.1A |
| It is possible for a magnet to have only one pole (Mono Pole) | false |
| Earth geographical south pole is a | magnetic north pole |
| The source of all magnetism (permanent magnets and electromagnets) is | moving electric charge |
| ⊗⊗⊗⊗⊗⊗⊗⊗⊗⊗⊗⊗⊗⊗⊗⊗ ⊗⊗⊗⊗⊗⊗⊗⊗⊗⊗⊗⊗⊗⊗⊗⊗ ⊗⊗⊗⊗⊗⊗⊗⊗⊗⊗⊗⊗⊗⊗⊗⊗ | Uniform magnetic field directed into the screen away from you |
| Why does a compass needle point north? | It lines up with the Earth's magnetic field |
| The area of magnetic force around a magnet is known as its | magnetic field |
| What happens to its kinetic and potential energy as a pendulum swings from its highest to the lowest position? | The PE decreases while the KE increases |
| You are pushing a crate rightwards with a mass of 10 kg. The surface is frictionless. Acceleration of the crate is 4.5 m/s/s. What is the net force act on the crate? | 45 Newtons |
| When you walk on the ground, your foot push against the ground, and the ground pushes back on you. The force that makes you walk is exerted by the ground. This scenario can be explained using Newton which law of motion? | Third Law of Motion |
| Which color (from the visible spectrum) produces the smallest wavelength? | violet |
| If an object absorbs light in all wavelengths, except red color what color does the object appear to be? | red |
| Which of the following technique doesn’t put anything into a patient’s body….No X rays/Strong Magnetic Fields/Radio waves/Radiotracers? | MEG |
| Which of the following phenomena of light are involved in the formation of a rainbow? | Reflection, refraction and dispersion |
| Read the following sentences carefully, and choose the incorrect one about human eye: | All of the above: The human eye works on the refraction of light, The eye lens is a convex lens made of a transparent, soft and flexible material like a jelly made of proteins, The focal length of a lens can be changed |
| Sunset is red because, at that time, the light coming from the sun has to travel | Greater thickness of earth’s atmosphere |
| We are able to see a mirrored image of the mountains on the water through... | reflection |
| What type of mirror is Rear view mirror of a vehicle? | convex mirror |
| What is the name of the equipment used to split the sun's light into its various colors to analyze it? | A spectrometer |
| What is the movement of electrons to create an emission spectra | jump from high to low energy levels |
| An electron will absorb energy when | jumping from the 1st orbit to the 3rd orbit |
| force = | mass x acceleration |
| PE = | mgh |
| KE = | 1/2mv^2 |
| p = | mass x velocity |
| L = | mass x radius^2 x angular velocity (moment ^ of inertia) |
| Speed = | position/time |
| velocity = | displacement/time = final velocity - initial velocity/time |
| d = | 1/2 x acceleration x time x time |
Created by:
alabamadean
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