# Quiz for the JUAS 2023 students – Special Relativity

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Quiz for JUAS students 2023 - Special Relativity

1 / 20

Is it possible that a pure magnetic field seen by one observer in one reference system is transformed into an electric and magnetic field in another reference system?

2 / 20

What is the difference between the Galilean and the Lorentz transformations?

3 / 20

What does 𝛽=0.5 mean?

4 / 20

For a source moving in the horizontal plane, what is the angle with respect to the vertical (perpendicular) plane where electric field lines are more concentrated at relativistic velocities?

5 / 20

What would be the energy of a proton accelerator in Fixed-Target mode to reach an energy of 100 TeV in the center of mass?

6 / 20

What is the difference between nuclear power plants and particle accelerators?

7 / 20

In the relativistic Doppler effect, the observed frequency from an observer going towards the light source, is

8 / 20

With 4-vectors, the scalar product is defined and invariant under Lorentz transformations?

9 / 20

What are the 2 postulates of Special Relativity? (select all relevant answers)

10 / 20

In the non-relativistic regime, what is the quantity that does not depend on the velocity of a charged particle moving in a constant magnetic field?

11 / 20

Which experiment led to the second postulate?

12 / 20

Does the electric field maintain the spherical symmetry when charges are moving?

13 / 20

What would be the energy per beam of a future proton collider at 100 TeV in the center of mass?

14 / 20

What is the relation linking the energy (E) , the momentum (p) and the rest mass (m0)?

15 / 20

What are the 2 relativistic Lorentz factors? (select all relevant answers)

16 / 20

What is the effect of accelerating charged particles which already move almost at the speed of light?

17 / 20

Will a moving object have a longer or shorter length (compared to its length at rest) for a stationary observer?

18 / 20

In the LHC, protons are injected at a total energy of 450 GeV and accelerated up to 7 TeV. Why should the LHC be called a “massificator” and not an accelerator? (several answers accepted)

19 / 20

What is the maximum speed of an object?

20 / 20

What happens to the velocity and the energy of a relativistic charged particle when we continue to accelerate it?