Physics questions and answers

Physics Questions and Answers

If you want to learn more about the nature and properties of matter and energy or you're simply preparing for a Physics exam, these Physics past questions and answers are ideal for you.

3,402.

Which of the following is used as nuclear reactor to slow down fast moving neutrons?

A.

Carbondioxide gas

B.

Liquid sodium metal

C.

Concrete shield

D.

Graphite rods

E.

Boron rods

Correct answer is D

No explanation has been provided for this answer.

3,403.

The phenomenon of radioactivity was first discovered by

A.

Marie Curve

B.

Sir J.J Thomson

C.

Henn Becquerel

D.

Niels Bohr

E.

Enrico Fermi

Correct answer is C

No explanation has been provided for this answer.

3,404.

lf Einstein’s photoelectric equation is represented by hf - W = Φ where h is Planck’s constant, f the frequency of incident radiation and W the work function of the material, what does the symbol Φ up stand for?

A.

Energy of the photons

B.

Maximum Kinetic energy of the ejected electrons

C.

Threshold frequency of the photons

D.

Stopping potential of the electrons

E.

Velocity of the electrons

Correct answer is B

No explanation has been provided for this answer.

3,405.

24 Na → 24 mg4 + X + energy
11         2                             

The equation above represents a nuclear decay of sodium isotope. What is X?

A.

Alpha particle

B.

Beta particle

C.

Gamma ray

D.

X-ray

E.

Neutron

Correct answer is B

No explanation has been provided for this answer.