6. The proton composition of quarks is a. uud b. uuu c. ddd d. udd 7. What are t
ID: 1267832 • Letter: 6
Question
6. The proton composition of quarks is
a. uud
b. uuu
c. ddd
d. udd
7. What are the properties of antiparticles?
a. Have negative mass and positive charge, so they clump in pairs
b. May be carried around only in massive lead containers
c. Have same mass and opposite charge to particles, and annihilate them on contact.
d. Have no mass or charge so are virtual particles
8. What are the main components of the LHC?
a. A long straight accelerating pipe, 7 particle traps, calorimeters
b. Radioactive sources, magnetic containment chambers, particle counters
c. Chemical batteries, fuel cells, huge capacitors
d. Underground accelerator tunnel, four detectors, control rooms
9. How do we know that the Universe is expanding?
a. Light arriving from distant galaxies has its wavelengths stretched-out
b. Other galaxies are getting dimmer and dimmer
c. Stars are observed to move in the sky away from us
d. The Sun is further from us now than at the times of the astronomical observations by Omar Khayyam in the XII century
10. Weakly interacting particles are called
a. leptons
b. nuclei
c. Higgs particles
d. bosons
Explanation / Answer
6. The proton composition of quarks is - a. uud
( The proton is a baryon and is considered to be composed of two up quarksand one down quark. )
7 - c. Have same mass and opposite charge to particles, and annihilate them on contact.
8 - b. Radioactive sources, magnetic containment chambers, particle counters
9 - a. Light arriving from distant galaxies has its wavelengths stretched-out
10 - a. leptons
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