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Free space: Quiz


Question 1: Today, however, the classical concept of vacuum as a simple void[11] is replaced by the quantum vacuum, separating "free space" still further from the real vacuum – quantum vacuum or the ________ is not empty.
Quantum electrodynamicsQuantum field theoryVacuum stateCasimir effect

Question 2: [37] In the partial vacuum of outer space, there are small quantities of matter (mostly hydrogen), ________ and cosmic noise.
StarSolar SystemAstronomyCosmic dust

Question 3: The ________ defines free space in a number of ways.
Canadian Intellectual Property OfficeUnited States Patent and Trademark OfficeMinority Business Development AgencyCorporate Affairs and Intellectual Property Office

Question 4: The definitions of the ampere and meter ________ are based upon measurements corrected to refer to free space.
International System of UnitsSystems of measurementMetric systemConversion of units

Question 5: See the discussion of vacuum in ________.
Black holeHawking radiationUniverseUnruh effect

Question 6: While only a partial vacuum, ________ contains such sparse matter that the pressure of interstellar space is on the order of 10 pPa (1×10−11 Pa)[35].
Outer spaceUniverseStarSun

Question 7: [16] One measurable result of these ephemeral occurrences is the ________.
Vacuum stateDirac equationQuantum field theoryCasimir effect

Question 8: The concept of free space is an abstraction from nature, a baseline or reference state, that is unattainable in practice, like the ________ of temperature.
EntropyCarbonAbsolute zeroThermodynamic temperature

Question 9: In addition, in free space the principle of ________ of potentials and fields holds: for example, the electric potential generated by two charges is the simple addition of the potentials generated by each charge in isolation.
Vector spaceSuperposition principleQuantum mechanicsWave

Question 10: In classical physics, free space is a concept of ________, corresponding to a theoretically perfect vacuum and sometimes referred to as the vacuum of free space, or as classical vacuum, and is appropriately viewed as a reference medium.
Magnetic fieldMetamaterialMaxwell's equationsElectromagnetism

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