აინშტაინის ფარდობითობის თეორია

The main postulate of Einstein's theory of relativity is:

• A moving clock is slower than when at rest

• A moving ruler is shorter than when at rest

• Light has wave and particle properties

• The laws of nature are the same in all inertial systems

According to Einstein's general theory of relativity, gravity is caused by:

• Attraction between massive bodies

• Curvature of space-time fabric

• Quantum interactions

• Electromagnetic interactions

Mass defect means:

• Difference in an object's mass in space and on Earth

• Loss of mass when an object starts moving at high speed

• Difference in nucleons in the nucleus

What does mass defect mean?

• The difference in an object's mass in space and on Earth

• The loss of mass when an object starts moving at high speed

• The difference between the total mass of nucleons in the nucleus and the mass of the nucleus

• The mass of a particle when it accelerates to the speed of light

What types of nuclear reactions are responsible for the energy production of the sun and other stars?

• Nuclear fusion

• Nuclear fission

• Radioactive decay

• Neutron emission

The atomic number of an element indicates:

• Its mass rounded to the nearest whole number

• The number of positive charges in the nucleus

• The number of neutrons in the nucleus

• The number of electrons

What does the atomic number of an element show?

• Its mass rounded to the nearest whole number

• The number of positive charges in the nucleus

• The number of neutrons in the nucleus

• The number of electrons in the nucleus

Which statement is incorrect?

• Neutrons and protons are called nucleons

• A neutron is neutral because it is made of a proton and an electron

• The mass of a neutron slightly exceeds that of a proton

• A neutron can cause a chain reaction