AP (Advanced Placement) Physics(B-C): Questions 298 - 300 of 921

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Question number: 298

» Magnetic Field & Electromagnetism

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MCQ▾

Question

The illustration shows a beam of protons entering a magnetic field at angle . Which of the following expressions can be used to determine the magnitude of the magnetic force on each proton as the beam enters the magnetic field?

A photon beam moves in magnetic field

A Photon Beam Moves in Magnetic Field

Choices

Choice (5)Response

a.

b.

c.

d.

The magnetic force would be zero.

e.

All of the above

Question number: 299

» Electric Circuits

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MCQ▾

Question

Which of the following statements is true regarding the electrical conductivity of a wire?

Choices

Choice (5)Response

a.

The electrical conductivity of a wire is proportional to the length of the wire.

b.

When an electric potential difference is applied across the metal, the resulting electric field causes electrons to move from one end of the wire to the other.

c.

Increasing the cross-sectional area of a wire increases the resistance to movement of electrons in the wire, so the conductivity decreases.

d.

None of the above

e.

Question does not provide sufficient data or is vague

Question number: 300

» Periodic Motion, Mechanical Waves & Sound

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MCQ▾

Question

Ultrasound can be used to speed up chemical reactions, because the ultrasonic signal

Choices

Choice (5)Response

a.

Breaks up solids in solutions, thereby increasing reaction rate

b.

Produces local extremes in temperature and pressure, thereby increasing reaction rate

c.

Can interact directly with molecules to give them the energy to react

d.

Both a. and b. are correct

e.

Question does not provide sufficient data or is vague

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