Modern Physics

Which fundamental force is primarily responsible for the attraction between protons and electrons?

• strong

• gravitational

• electromagnetic

• weak

What are the subatomic particles called that make up both protons & neutrons?

The electron is classified as a

Which type of fundamental force overcomes the repulsive, electrostatic force between protons in the nucleus of an atom?

• the gravitational force

• the weak force

• the strong force

• the magnetic force

A proton has a quark content of uud.

What is the quark content of an antiproton?

• ūūđ

• uūđ

• ūđd

• tcs

What kind of particle has a composition of bđ ?

• a meson

• a boson

• a baryon

• a quark

What is the mass of an antineutron in kilograms?

• 1.67 x 10 ^-27 kg

• -1.67 x 10 ^-27 kg

• +1 u

• -1 u

The total conversion of 1.00 kilogram of the sun’s mass into energy yields

• 9.31 × 10² MeV

• 3.00 × 10⁸ J

• 8.38 × 10¹⁹ MeV

• 9.00 × 10¹⁶ J

Which graph best represents the relationship between photon energy and photon frequency?

• (1)

• (2)

• (3)

• (4)

The diagram represents the sequence of events (steps 1 through 10) resulting in the production of a D- meson and a D+ meson. An electron and a positron (antielectron) collide (step 1), annihilate each other (step 2), and become energy (step 3). This energy produces an anticharm quark and a charm quark (step 4), which then sprit apart (steps 5 to 7). As they split, a down quark and an antidown quark are formed, leading to the final production of a D- meson and a D+ meson (steps 8 to 10).

Which statement best describes the changes that occur in this sequence of events?

• Energy is converted into matter and then mattern is converted into energy.

• Matter is converted into energy and then energy is converted into matter.

• isolated quarks are being formed from baryons

• Hadrons are being converted into leptons.