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Questions and Answers
What does the negative sign in Faraday's Law of induction indicate?
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?
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?
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?
What type of circuit has equal current flowing through both the inductor and capacitor?
What is the thin watery jelly that fills the eye at the back of the lens?
What is the thin watery jelly that fills the eye at the back of the lens?
What happens to a light ray when it passes from air into seawater?
What happens to a light ray when it passes from air into seawater?
What is the relation between D and C?
What is the relation between D and C?
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?
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?
Where must an object be placed in front of a concave mirror to achieve a same size, inverted image of the object?
Where must an object be placed in front of a concave mirror to achieve a same size, inverted image of the object?
What type of converging lens is shown in the diagram?
What type of converging lens is shown in the diagram?
What is the angle called when the refracted ray moves parallel to the boundary, making the angle of refraction equation 90o?
What is the angle called when the refracted ray moves parallel to the boundary, making the angle of refraction equation 90o?
Which of the properties of waves also apply to sound waves?
Which of the properties of waves also apply to sound waves?
What is the famous equation that relates energy and mass?
What is the famous equation that relates energy and mass?
What will NOT happen when a rocket travels at a speed of 0.9c?
What will NOT happen when a rocket travels at a speed of 0.9c?
A radioactive sample has a mass of 16g and a half-life of 10 days. What mass will remain after 20 days?
A radioactive sample has a mass of 16g and a half-life of 10 days. What mass will remain after 20 days?
If the half-life of Thorium is 24 days, what amount of a 12-gram sample will remain after 96 days?
If the half-life of Thorium is 24 days, what amount of a 12-gram sample will remain after 96 days?
Which sample(s) will have the least amount remaining after 4 days?
Which sample(s) will have the least amount remaining after 4 days?
What physical property does NOT change when an object approaches the speed of light?
What physical property does NOT change when an object approaches the speed of light?
What is the refractive index of a medium with a relative magnetic permeability of 3.25 and a relative electrical permittivity of 1.5?
What is the refractive index of a medium with a relative magnetic permeability of 3.25 and a relative electrical permittivity of 1.5?
What phenomenon occurs when a wave passes from one medium to another with a change in speed?
What phenomenon occurs when a wave passes from one medium to another with a change in speed?
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?
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?
What determines the frequency of a pendulum?
What determines the frequency of a pendulum?
What type of current occurs when electrons vibrate back and forth from negative to positive and vice versa?
What type of current occurs when electrons vibrate back and forth from negative to positive and vice versa?
What is necessary to induce a current in the reader when a credit card is swiped?
What is necessary to induce a current in the reader when a credit card is swiped?
What is the phenomenon where electrons are emitted when electromagnetic radiation falls on an object?
What is the phenomenon where electrons are emitted when electromagnetic radiation falls on an object?
What will happen to the energy of an object if its momentum is increased by 2 times?
What will happen to the energy of an object if its momentum is increased by 2 times?
What is the famous equation that expresses the amount of energy released when a mass is converted to energy?
What is the famous equation that expresses the amount of energy released when a mass is converted to energy?
What will happen to your paycheck if you travel at a speed near that of light and then return to Earth?
What will happen to your paycheck if you travel at a speed near that of light and then return to Earth?
What is the effect of light frequency on the emission of electrons from a semiconductive material?
What is the effect of light frequency on the emission of electrons from a semiconductive material?
What is the relative passage of time on the rocket's clock as observed by someone traveling at a speed near that of light?
What is the relative passage of time on the rocket's clock as observed by someone traveling at a speed near that of light?
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