Modern physics concepts

According to modern physics, how does the behavior of time and length change?

• They are constant and do not change.

• They depend on the speed of the object traveling.

• They increase with the increase in energy.

• They are only affected by gravitational forces.

What is the only constant speed in a vacuum according to the key ideas in the chapter?

• Speed of sound

• Speed of light

• Speed of electricity

• Speed of wind

What famous equation is mentioned that relates mass and energy?

• F = ma

• pV = nRT

• E = mc^2

• ΔE = q + w

What is the speed of light in a vacuum described as?

• Variable depending on the medium

• Constant

• Dependent on the energy of the light

• Increasing with time

According to the mass-energy equivalence formula, what does E = mc^2 imply?

• Energy can be converted into mass

• Mass can be converted into energy

• Both mass can be converted into energy and vice versa

• Mass remains constant when energy increases

What property do massless particles such as photons exhibit?

• They cannot move

• They have mass-like properties such as momentum

• They are visible to the naked eye

• They have infinite mass

What must occur for an electron in an atom to move up in energy levels?

• It must emit a photon

• It must absorb a photon

• It must remain stationary

• It must lose an electron

What is the term used to describe the time it takes for one-half of a radioactive material to decay?

• Radioactive period

• Decay constant

• Half-life

• Decay rate

Which of the following is NOT a type of decay mentioned in the text?

• Alpha decay

• Beta decay

• Sigma decay

• Gamma decay

Which conservation law is not mentioned as being obeyed in all nuclear reactions?

• Conservation of energy

• Conservation of momentum

• Conservation of mass

• Conservation of velocity