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RF Cafe began life in 1996 as "RF Tools" in an AOL screen name web space totaling 2 MB. Its primary purpose was to provide me with ready access to commonly needed formulas and reference material while performing my work as an RF system and circuit design engineer. The World Wide Web (Internet) was largely an unknown entity at the time and bandwidth was a scarce commodity. Dial-up modems blazed along at 14.4 kbps while tying up your telephone line, and a nice lady's voice announced "You've Got Mail" when a new message arrived...

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Numerical Constants
RF Cafe Quiz #15

All RF Cafe Quizzes make great fodder for employment interviews for technicians or engineers - particularly those who are fresh out of school or are relatively new to the work world. Come to think of it, they would make equally excellent study material for the same persons who are going to be interviewed for a job. Bonne chance, Viel Glück, がんばろう, buena suerte, удачи, in bocca al lupo, 행운을 빕니다, ádh mór, בהצלחה, lykke til, 祝你好運. Well, you know what I mean: Good luck!

Click here for the complete list of RF Cafe Quizzes.

Note: Some material based on books have quoted passages.

1. To which constant is 6.022*10²³/ mol assigned?

a) universal constant

b) Avogadro's constant

c) electric field

d) gravitational constant

2. To which constant is 2.718 assigned?

a) base of natural logarithms

b) base of unnatural logarithms

c) ratio of major and semi-major axis of an ellipse

d) dielectric constant of ceramic

3. To which constant is 9,192,631,770 assigned?

a) astronomical unit

b) oscillations of a cesium atom in exactly one second

c) picoangstroms in a meter

d) hours in a lightyear

4. To which constant is 1.616*10^-35 m assigned?

a) Planck length

b) thickness of a human hair

c) wavelength of yellow light

d) tolerance of the standard meter

5. To which constant is 9.11*10^-28 g assigned?

a) neutron rest mass

b) proton acceleration

c) electron rest mass

d) photon acceleration

6. To which constant is 9.81 m/s² assigned?

a) speed of light in a vacuum

b) dielectric constant of a vacuum

c) acceleration of gravity near Earth's surface

d) magnetic constant

7. To which constant is 8.854*10^-12 F/m assigned?

a) rate of change of temperature in silicon

b) speed of light in a vacuum

c) permittivity of free space

d) permeability of free space

8. To which constant is 2.998*10⁸ km/s assigned to?

a) orbital velocity

b) electron speed

c) acceleration of gravity

d) speed of light in a vacuum

9. To which constant is 1.3807*10^-23 J/K assigned?

a) universal gas constant

b) carbon band energy

c) uranium band energy

d) Boltzmann's constant

10. To which constant is 1.257*10^-6 H/m assigned?

a) Bohr radius

b) speed of light in a vacuum

c) permittivity of free space

d) permeability of free space

Need some help? Click here for the answers and explanations.

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Numerical ConstantsRF Cafe Quiz #15

Numerical Constants
RF Cafe Quiz #15