IB IB Physics 3

Question 1

What does Einstein's equation E = mc² express?

Accepted Answer

Mass-energy equivalence

Answer

The kinetic energy of a moving object

Answer

The photoelectric effect

Answer

Nuclear binding energy per nucleon

Question 2

In nuclear physics, what is nuclear fission?

Accepted Answer

The splitting of a heavy nucleus into lighter nuclei

Answer

Combining two light nuclei to form a heavier nucleus

Answer

Emission of an alpha particle from a nucleus

Answer

The transformation of a proton into a neutron

Question 3

In the photoelectric effect, what happens when the intensity of light is increased without changing its frequency?

Accepted Answer

The number of emitted electrons increases

Answer

The maximum kinetic energy of emitted electrons increases

Answer

The threshold frequency decreases

Answer

The work function of the metal decreases

Question 4

What is absolute zero on the Kelvin temperature scale?

Accepted Answer

0 K

Answer

-100 K

Answer

-273 K

Answer

273 K

Question 5

Which gas law states that the pressure of an ideal gas is inversely proportional to its volume at constant temperature?

Accepted Answer

Boyle's Law

Answer

Charles's Law

Answer

Gay-Lussac's Law

Answer

Avogadro's Law

Question 6

In radioactive decay, what does 'half-life' mean?

Accepted Answer

The time for half the atoms in a sample to undergo radioactive decay

Answer

The time for a radioactive substance to completely decay

Answer

The energy released when half the sample decays

Answer

The time for radiation intensity to double

Question 7

Which subatomic particles are found in the nucleus of an atom?

Accepted Answer

Protons and neutrons

Answer

Protons and electrons

Answer

Neutrons and electrons

Answer

Protons, neutrons, and electrons