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GUIDE QUESTION 2024
What is one property of a wave that determines how much it will diffract when it encounters an obstacle? - Correct Answers ✅ Wavelength Other things being equal, the pendulum that has the longest period will be the - Correct Answers ✅ longest one A wave has a wavelength of 10 mm and a frequency of 5.0 hertz. What is its speed? - Correct Answers ✅ 50 mm/s The distance from the top of one wave crest to the next is called the - Correct Answers ✅ wavelength A wave that has a relatively long wavelength will also have a relatively - Correct Answers ✅ long period Of the following, sound travels fastest in which medium? - Correct Answers ✅ Sound travels fastest in steel. The Doppler effect is caused by - Correct Answers ✅ relative motion between the wave source and the observer.
GUIDE QUESTION 2024
The intensity of a sound wave depends on the - Correct Answers ✅ amplitude of the wave. Destructive interference of sound waves occurs when - Correct Answers ✅ two waves arrive at the same point out of phase with each other. Beats occur in sound waves when - Correct Answers ✅ waves from two sources of slightly different frequencies are heard together. In general, sound travels most rapidly in ___, less rapidly in ___, and even less rapidly in ___. - Correct Answers ✅ solids; liquids; gases A piano, violin, or guitar uses the resonance of a wooden soundboard to
- Correct Answers ✅ amplify the sound. Reflection of sound waves produces the phenomenon known as - Correct Answers ✅ an echo. An echo is caused by - Correct Answers ✅ reflection of sound waves. When a wave strikes a solid barrier, it behaves like a basketball hitting a backboard. This wave behavior is called - Correct Answers ✅ reflection.
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If frequency increases, the - Correct Answers ✅ number of waves increases. Which one of the following is most likely to be impossible? - Correct Answers ✅ None of the above n 10 If you generate a new pulse like the first but more quickly, the pulse would be - Correct Answers ✅ narrower. If you strip electrons from an atom, the atom becomes a - Correct Answers ✅ positive ion. An object can acquire an electrical charge by - Correct Answers ✅ friction, contact, or induction. According to Coulomb's law, if the distance between two charges is doubled, the force each charge exerts on the other will be ___ its previous value - Correct Answers ✅ one fourth of The unit of electrical charge is the - Correct Answers ✅ coulomb
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A material will be a ____ if it does not contain charges that are free to move around within the matter. - Correct Answers ✅ poor conductor A material will be a ____ if it does not contain charges that are free to move around within the matter. - Correct Answers ✅ good insulator In conductors, electrons can flow because their - Correct Answers ✅ electrons are free and mobile. The unit of electric current is the - Correct Answers ✅ ampere. A steady current of 2.5 A flows in a wire for 4.0 minutes. How much charge passed through any point in the circuit? - Correct Answers ✅ 600 C The unit of electric potential is the - Correct Answers ✅ volt The current through a 10-ohm resistor connected to a 120-V power supply is - Correct Answers ✅ 12 amps. If three light bulbs of different wattage are connected in series to a battery, the - Correct Answers ✅ current in each light bulb will be the same.
GUIDE QUESTION 2024
If you have two resistors (both 50 Ohm resistors) connected in series to your circuit, which one would have the greater voltage? - Correct Answers ✅ They would both have the same voltage. If you build a circuit similar to those built in the simulation but with real equipment, how would you determine the resistance of the resistor? - Correct Answers ✅ Measure the current and voltage and then use Ohm's law. If you have two resistors (a 50 Ohm and a 10 Ohm) connected in parallel to your circuit, which one would have the greater voltage? - Correct Answers ✅ They would both have the same voltage. If you have two resistors (a 50 Ohm and a 10 Ohm) connected in series to your circuit, which one would have the greater voltage? - Correct Answers ✅ The 50 Ohm resistor would have the greater voltage. Explain the difference between connecting an ammeter versus connecting a voltmeter when using the simulation. - Correct Answers ✅ The ammeter is added within the circuit and the voltmeter has a probe you touch to places in the circuit.
GUIDE QUESTION 2024
If you have two resistors (a 50 Ohm and a 10 Ohm) connected in series to your circuit, which one would have the greater current? - Correct Answers ✅ They would both have the same current. Which of the following statements describes the interaction between magnetic poles? - Correct Answers ✅ Like poles repel each other, and opposite poles attract each other. Which of the following that is not affected by a magnetic field? - Correct Answers ✅ Stationary charge Three 10 ohm resistors are connected in series to a 12 V battery. The total current in the circuit is - Correct Answers ✅ 0.4 amps. A straight wire of length 0.20 m moves at a steady speed of 3.0 m s-1 at right angles to a magnetic field of flux density 0.10 T. EMF induced across the ends of the wire is - Correct Answers ✅ 0.06 V. What creates a magnetic field? - Correct Answers ✅ Moving electric charges Which force field can accelerate an electron but never change its speed? - Correct Answers ✅ Magnetic field
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Currents that flow in circles inside a disc are known as - Correct Answers ✅ eddy currents. A device that converts electrical energy into mechanical energy is a(an)
- Correct Answers ✅ DC motor. A transformer is a device that is used in a(an) - Correct Answers ✅ AC circuit. Emf can be induced in a circuit by - Correct Answers ✅ all of above. Which compass shows the correct direction of the electromagnet at point A caused by the battery to the left of point A? - Correct Answers ✅ the correct compass is the compass pointing left(red) and right(white) By accelerating a magnet inside a coil, the current in it - Correct Answers ✅ increases For a straight wire, an induced current depends upon the - Correct Answers ✅ all of above.
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What would you expect the light to do if you change the coils from 2 to 3 as shown in the diagram and you move the magnet at the same speed? - Correct Answers ✅ Show more brightness Which compass shows the correct direction of the magnetic field at point A caused by the magnet below point A with the north end of the magnet on the right-hand side? - Correct Answers ✅ with the A in the upper left corrner of the magnet with S(left), N(right) the correct compass would be pointing diagnal with white pointing towards A Moving a coil in and out of a magnetic field induces - Correct Answers ✅ emf. Induced current in a coil by a magnet turns it into a(an) - Correct Answers ✅ electromagnet. Which would be a stronger electromagnet, the one with the larger coils (A) or the smaller coils (B)? - Correct Answers ✅ A would be the stronger electromagnet. When a field is parallel to the plane of an area, the magnetic flux through the coil is - Correct Answers ✅ zero
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A diverging lens is - Correct Answers ✅ thinner in the middle than at the edges. The image you see in the mirror on your bathroom wall is - Correct Answers ✅ virtual and upright. A plane mirror produces an image that is - Correct Answers ✅ virtual and upright. A 6-cm-high candle is placed in front of a converging lens with a focal length of magnitude 30 cm. If the image distance is +50 cm, then find the image height of the candle and whether it is upright or inverted. - Correct Answers ✅ 4.0 cm inverted The energy of a photon is related to - Correct Answers ✅ all of these. (the energy level difference through which it falls, the energy given to the atom that emits it, its frequency.) Which of the following is a property of light waves but not of sound waves? - Correct Answers ✅ Polarization
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The colors seen in a soap bubble are most closely related to the phenomenon of - Correct Answers ✅ interference The ratio of sin(x°) of the angle of incidence to sin(x°) of the angle of refraction is - Correct Answers ✅ Snell's law. A beam of light enters the flat surface of a diamond at an angle of 30° from the normal. The angle of refraction in the diamond is measured to be 12° from the normal. Determine the speed of light in the diamond. - Correct Answers ✅ 1.2 x 10^8 m/s Rays of light are always refracted in a(an) - Correct Answers ✅ definite direction. Light refracts when traveling from air into glass because light - Correct Answers ✅ travels slower in glass than in air. A beam of light passes from air into water. Which of the following statements is true? - Correct Answers ✅ The angle of incidence is greater than the angle of refraction in the water. A change in the speed of light is known as - Correct Answers ✅ refraction
GUIDE QUESTION 2024
Mass number tells us the number of - Correct Answers ✅ particles in the nucleus. Thompson's model of the atom is - Correct Answers ✅ like plum pudding. In the photoelectric effect, doubling the frequency of incident light will cause the maximum energy of ejected electrons to - Correct Answers ✅ more than double. The ratio of the energy of a photon to its frequency is - Correct Answers ✅ Planck's constant. Isotope A has a half-life measured in minutes, whereas isotope B has a half-life of millions of years. Which is more radioactive? - Correct Answers ✅ Isotope A is more radioactive. In radioactive decay, some isotopes release a small amount of energy which can be used to - Correct Answers ✅ generate electric current. The radioactive isotope Z has a half-life of 12 hours. After 2 days, the fraction of the original amount remaining is - Correct Answers ✅ 1/16.
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A Geiger counter placed 1 meter from a point source of radiation registers 100 counts per second. What will the count rate be if the Geiger counter is moved closer—to 0.5 meter from the source? - Correct Answers ✅ 400 counts/s What particle is needed to complete the following equation? 7N^14 + ____ → 6C^14 + 1H1 - Correct Answers ✅ 0n Which of the following correctly balances this decay reaction? 230TH -->-1e+____ 90 - Correct Answers ✅ 230Pa 91 Estimate how much fission must occur each second to supply a day's energy to a private household in a temperate climate (about 55 kilowatt-hrs). Assume each fission releases 200 MeV (million electron volts). Use ® 1 eV = 1.6 x 10-19J and/or 1 watt = 1 J/s - Correct Answers ✅ 10,000 billion fissions per second Which of the following describes what occurs in the fission process? - Correct Answers ✅ A heavy nucleus is fragmented into lighter ones.
GUIDE QUESTION 2024
mass of iodine-131 that should be used for treatment? - Correct Answers ✅ 16 g Use the following chart to answer this question. The chart shows uranium-235 with the daughter isotope of lead-207 and the half-life is 710 million years. The second option is potassium-40 with a daughter isotope in 1.3 billion years. The last option is carbon-14 with a daughter isotope of nitrogran-14 in 5730 years. If an archeologist claimed to have found an artifact from the early bronze age in Egypt (around the year 3000 BC), which isotope would be the most effective in examining it? - Correct Answers ✅ Carbon-14 would be most effective. During a second half-life, the original material has decayed - Correct Answers ✅ 75%. A student performs an experiment to measure the half-life of a radioactive isotope. First, they use a suitable detector and counter and measure the average background radiation to be 120 counts per minute (cpm). Next, they measure the activity with the radioactive isotope in place, and they record a reading of 1080 cpm. Finally, they repeat the experiment 12 hours later with the radioactive isotope still in place and record a count rate of 240 cpm. The half-life of the sample is approximately - Correct Answers ✅ 4 hours.
GUIDE QUESTION 2024
All isotopes decay in the same pattern. What is the main difference in the graphs showing the rate of decay for different radioactive isotopes?
- Correct Answers ✅ The time it takes for a half-life to occur What is the difference between inertial and non-inertial frames of reference? - Correct Answers ✅ Inertial frame of reference does not take into account fictitious forces while non-inertial frame of reference does take these into account. According to Einstein's second postulate in the special theory of relativity, - Correct Answers ✅ light always travels at the same speed through a medium. Length in the direction of motion is contracted. This means an object that is one meter long - Correct Answers ✅ and moving at a speed near the speed of light will actually be shorter than the same object at rest. In the Michelson-Morley experiments, two light beams were raced at right angles to each other to detect a possible slight difference in their speeds. The experiment showed that - Correct Answers ✅ the races always ended in ties. Which of the following correctly describes the relationship between Newton's theory of gravity and general relativity? - Correct Answers ✅ Newton's theory of gravity is an approximation to general relativity
