AP (Advanced Placement) Physics(B-C): Questions 807 - 809 of 920

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Question number: 807

» Atomic & Nuclear Physics

MCQ▾

Question

The radioactive element radium has a half-life of days. Which of the following statements is true regarding one nucleus of radium after days in terms of probability?

Choices

Choice (5) Response

a.

Half of the nucleus has decayed.

b.

The nucleus will decay only when a second nucleus is brought into contact with it.

c.

There is a chance the nucleus will have decayed.

d.

The nucleus won’t decay prior to days, but should decay after that time.

e.

All of the above

Question number: 808

» Light & Optics

MCQ▾

Question

As a ray of light moves from a medium with a lower index of refraction into a medium with a higher index of refraction,

Choices

Choice (5) Response

a.

Speed and wavelength increase, while frequency remains the same

b.

Speed and frequency decrease, while wavelength remains the same

c.

Speed and wavelength decrease, while frequency remains the same

d.

Speed decreases, while frequency and wavelength remain the same

e.

Question does not provide sufficient data or is vague

Question number: 809

» Torque and Equilibrium

MCQ▾

Question

A metal rod placed on two supports

A Metal Rod Placed on Two Supports

In figure a uniform metal rod placed on two supports are shown.

In figure, a uniform metal rod of mass of and length rests horizontally on two supports. Support is under right end of the metal rod and Support is from the left end. If and are the forces on support and support , respectively; then which of the following shows correct values of and ?

Choices

Choice (5) Response

a.

b.

c.

d.

e.

All of the above

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