Electromagnetic Induction Quiz
30 Questions
1 Views

Choose a study mode

Play Quiz
Study Flashcards
Spaced Repetition
Chat to lesson

Podcast

Play an AI-generated podcast conversation about this lesson

Questions and Answers

What does the negative sign in Faraday's Law of induction indicate?

  • All of these (correct)
  • Direction of current
  • Direction of magnetic field
  • Direction of induced emf

    • What can induce an electric current in a loop of wire?

  • Changing the angle of the electric field
  • Changing the electric field
  • Changing the magnetic field (correct)
  • None of these

    • What enables alternating current to transfer more effectively over long distances?

  • Height of power lines
  • Use of AC generator
  • Step up and step down transformers reducing power loss (correct)
  • Very high voltage

    • What type of circuit has equal current flowing through both the inductor and capacitor?

    <p>Parallel circuit</p> Signup and view all the answers

    What is the thin watery jelly that fills the eye at the back of the lens?

    <p>Vitreous humor</p> Signup and view all the answers

    What happens to a light ray when it passes from air into seawater?

    <p>It is refracted</p> Signup and view all the answers

    What is the relation between D and C?

    <p>D is the amplitude while C is the peak-to-peak value</p> Signup and view all the answers

    What type of mirror is being used in the situation where a man’s face is 17.0 cm in front of a shaving mirror with a focal length of -10 cm?

    <p>Convex mirror</p> Signup and view all the answers

    Where must an object be placed in front of a concave mirror to achieve a same size, inverted image of the object?

    <p>Between the center of curvature and focus</p> Signup and view all the answers

    What type of converging lens is shown in the diagram?

    <p>Positive meniscus lens</p> Signup and view all the answers

    What is the angle called when the refracted ray moves parallel to the boundary, making the angle of refraction equation 90o?

    <p>Critical angle</p> Signup and view all the answers

    Which of the properties of waves also apply to sound waves?

    <p>II, III, and IV</p> Signup and view all the answers

    What is the famous equation that relates energy and mass?

    <p>E = m × c</p> Signup and view all the answers

    What will NOT happen when a rocket travels at a speed of 0.9c?

    <p>The mass of objects inside the rocket will seem to decrease</p> Signup and view all the answers

    A radioactive sample has a mass of 16g and a half-life of 10 days. What mass will remain after 20 days?

    <p>1.25g</p> Signup and view all the answers

    If the half-life of Thorium is 24 days, what amount of a 12-gram sample will remain after 96 days?

    <p>0.75g</p> Signup and view all the answers

    Which sample(s) will have the least amount remaining after 4 days?

    <p>A and B</p> Signup and view all the answers

    What physical property does NOT change when an object approaches the speed of light?

    <p>Mass</p> Signup and view all the answers

    What is the refractive index of a medium with a relative magnetic permeability of 3.25 and a relative electrical permittivity of 1.5?

    <p>3.27</p> Signup and view all the answers

    What phenomenon occurs when a wave passes from one medium to another with a change in speed?

    <p>Refraction</p> Signup and view all the answers

    What is the characteristics of the image formed by a concave mirror when the object is between the focal point and the center of curvature?

    <p>Real, inverted, and reduced</p> Signup and view all the answers

    What determines the frequency of a pendulum?

    <p>The length of the string of the pendulum</p> Signup and view all the answers

    What type of current occurs when electrons vibrate back and forth from negative to positive and vice versa?

    <p>AC</p> Signup and view all the answers

    What is necessary to induce a current in the reader when a credit card is swiped?

    <p>The magnetic field in the credit card strip needs to move</p> Signup and view all the answers

    What is the phenomenon where electrons are emitted when electromagnetic radiation falls on an object?

    <p>Photoelectric effect</p> Signup and view all the answers

    What will happen to the energy of an object if its momentum is increased by 2 times?

    <p>Increase by 2 times</p> Signup and view all the answers

    What is the famous equation that expresses the amount of energy released when a mass is converted to energy?

    <p>E = m times c squared</p> Signup and view all the answers

    What will happen to your paycheck if you travel at a speed near that of light and then return to Earth?

    <p>It will be smaller than if you had remained on Earth</p> Signup and view all the answers

    What is the effect of light frequency on the emission of electrons from a semiconductive material?

    <p>Electrons are emitted only if the light frequency is above a certain threshold</p> Signup and view all the answers

    What is the relative passage of time on the rocket's clock as observed by someone traveling at a speed near that of light?

    <p>Slower than the passage of time on the watch on the wrist</p> Signup and view all the answers

    More Like This

    Use Quizgecko on...
    Browser
    Open
    Browser
    Browser