읽고 생각하는 문제

☞10월호 문제

☞11월호 문제

☞12월호 문제

☞01월호 문제

☞02월호 문제

읽고 생각하는 과학문제

● 2월호 문제                                                              ☞2월호 문제풀이

"요번에 문제가 많은 것 같군요. 아울러 2월29일까지 답을 보내달라고 교정하여야 하며

Vocabulary and reading comprehension   

The Discovery Machine Give approximate definitions or explanations of these words and terms. You may use the web and Google.

i. “"hadron”"

ii. “"terascale”"

iii. “"Higgs“"

iv. “"touch wood”"

v. “"mammoth machine”"

vi. “"The most cataclysmic of the smashups”"

vii. “"spam filter”"

viii. “"step-by-step”"

ix. “"Herculean”"

x. “"tier 0”" or “"tier 1”"

 

 

Comprehension question on this article Is the author definite in his projections about the LHC, or is he hesitant about schedules and accomplishments? ( One clue is whether the author uses the future tense (“"will”") or the conditional verb “"would”".) The Coming Revolutions in Particle Physics Give approximate definitions or explanations of these words and terms. You may use the web and Google.

i. “"heady”"

ii. “"landmark”"

iii. “"purview“"

iv. “"quarks and leptons”"

v. “"gluons”"

vi. “"Supertechifragilisticeexpialidocious”" (this is not an actual word)

vii. “"supersymmetry”"

viii. “"technicolor”"

 

 

Comprehension question on this article Is the author certain about what will or

might happen at the LHC, or is he uncertain and cautious in his claims?

Building the Next-Generation Collider Give approximate definitions or explanations of these words and terms. You may use the web and Google.

i. “"composite”" and “"fundamental”"

ii. “"groundbreaking discovery”"

iii. “"in a nutshell”"

iv. “"undulator“"

v. “"at full speed”"

vi. “"linac”"

vii. “"price tag may be steep”"

 

 

Comprehension question on this article Are the authors of this article making

a strong emotional plea for the ILC, or are they presenting dispassionate plans for its construction?

 

 

Numerical problems

1. It is stated in “"The Discovery Machine”" that during a fullMoon at high tide Geneva rises by 25 cm and the circumference of the LHC ring increases by 1 mm. As a consequence, the beam energy changes by 0.02%. Check if these numbers are correct by solving this problem.

 

2. The CMS detector has Resistive Plate Chambers (RPCs) built at Korea University and surrounding the experiment at its outer radii. The RPCs at the ends are about 8 m from the interaction point where the particles are created in collisions. By the time particles from one collision reach these RPCs,

 

A. another collision has already happened

B. the next collision has not happened

C. a collision is about happening at this time

 

3. What is the ratio of the highest mass quark to the lowest mass quark?

A. 1

B. 102

C. 103

D. 104

E. 105

 

4. What is the ratio of the highest mass charged lepton to the lowest mass charged lepton?

A. 4

B. 40

C. 400

D. 4000

E. 40, 000

 

5. What geometrical object has the highest symmetry?

A. a cylinder

B. a sphere

C. a cube

D. a 3-sided pyramid (tetrahedron)

E. a 4-sided pyramid

 

6. What is the energy of the electrons and positrons emerging from the 11.3 km linacs if the superconducting radio-frequency cavities (SCRF) generate an electric field of 35 MV/m, and the SCRF fill about 60% of the linac length ?

A 400 MeV

B 2.5 GeV

C 25 GeV

D 250 GeV

E 400 GeV

 

7. How long does it take for a bunch of electrons to travel the length of the linac?

A. 10 ns

B. 40 ns

C. 1 μs

D. 40 μs

E. 1 ms