Electromagnetic Induction Quiz

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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?

Parallel circuit Signup and view all the answers

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

Vitreous humor Signup and view all the answers

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

It is refracted Signup and view all the answers

What is the relation between D and C?

D is the amplitude while C is the peak-to-peak value 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?

Convex mirror 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?

Between the center of curvature and focus Signup and view all the answers

What type of converging lens is shown in the diagram?

Positive meniscus lens 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?

Critical angle Signup and view all the answers

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

II, III, and IV Signup and view all the answers

What is the famous equation that relates energy and mass?

E = m × c Signup and view all the answers

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

The mass of objects inside the rocket will seem to decrease 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?

1.25g 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?

0.75g Signup and view all the answers

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

A and B Signup and view all the answers

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

Mass 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?

3.27 Signup and view all the answers

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

Refraction 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?

Real, inverted, and reduced Signup and view all the answers

What determines the frequency of a pendulum?

The length of the string of the pendulum Signup and view all the answers

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

AC Signup and view all the answers

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

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

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

Photoelectric effect Signup and view all the answers

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

Increase by 2 times 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?

E = m times c squared 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?

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

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

Electrons are emitted only if the light frequency is above a certain threshold 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?

Slower than the passage of time on the watch on the wrist Signup and view all the answers