Custom Search
Over 10000 Pages Indexed
Your Host
Click here to read about RF CafeKirt
Blattenberger

... single-
handedly
redefining
what an
engineering website
should be.

View the YouTube RF Cafe Intro Video Carpe Diem!
(Seize the Day!)

5CCG (5th MOB):
My USAF radar shop

Hobby & Fun

Airplanes and Rockets:
My personal hobby website

Equine Kingdom:
My daughter Sally's horse
riding business website -
lots of info

•−•  ••−•    −•−•  •−  ••−•  •
RF Cafe Morse Code >Hear It<

Job Board

About RF Cafe©

RF Cafe E-Mail

Numerical Constants
Answers to RF Cafe Quiz #15

| 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 |
| 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 | 24 | 25 | 26 | 27 | 28 |
| 29 | 30 | 31 | 32 | 33 | 34 | 35 | 36 | 37 | 38 | 39 | 40 | 41 |
| 42 | 43 | 44 | 45 | 46 | 47 | 48 | 49 | 50 | 51 | 52 | 53 | 54 |
| 55 | 56 | 57 | 58 | 59 | 60 | 61 |

All RF Cafe quizzes would make perfect 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.

Some of these books used in quizzes are available as prizes in the monthly RF Cafe Giveaway.

Note: Many answers contain passages quoted from the text.



Return to RF Cafe Quiz #15




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

b) Avogadro's constant

Avogadro's number is the number of entities of a substance to make a mole. Avogadro's number is formally defined to be the number of carbon-12 atoms in 12 grams of unbound carbon-12 in its rest-energy electronic state. So, there are 6.022*1023 carbon-12 atoms in a gram of carbon-12.



2. To which constant is 2.718 assigned?

a) base of natural logarithms

e1 = 2.718281828...
The definition is based on the fact that the area of the region under the curve of a hyperbola (y=1/x) to the x-axis, between 1 and e, equals 1. That gives the relationship in calculus where
       ln(e)=∫1/x*dx, between x=1 and x=e



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

b) oscillations of a cesium-133 atom in exactly one second

The cesium atom's natural frequency was formally recognized as the new international unit of time in 1967: the second was defined as exactly 9,192,631,770 oscillations or cycles of the cesium atom's resonant frequency.



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

a) Planck length

The Planck length is often defined as the shortest possible length, but what it really means if the shortest possible measurable length. This is because quantum effects significantly distort the measurement of distances smaller than the Planck length.



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

c) electron rest mass

I'll let Jorge, of the Journal of Theoretics explain it.



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

c) acceleration of gravity near Earth's surface

To be more exact, it is the acceleration of gravity at the latitude of the Royal Observatory in the U.K.. Due to centrifugal force created by the Earth's rotation about its axis, the measured force is greater near the poles than near the equator.



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

c) permittivity of free space

This is often written as ε0. The permittivity of free space (ε0) is related to the speed of light and the permeability of free space (μ0) by the following familiar equation  1/c = √(ε0*μ0)



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

d) speed of light in a vacuum

The speed of light in vacuum is defined to be exactly 299,792,458 meters per second.



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

a) Boltzmann's constant

The Boltzmann constant (k) relates energy and temperature at the particle level. Numerically, it is equal to the gas constant (R) divided by the Avogadro constant (Na), and it appears in equations like for noise in a given bandwidth (kTB).



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

d) permeability of free space
This is often written as μ0. The permeability of free space (μ0) is related to the speed of light and the permittivity of free space (ε0) by the following familiar equation  1/c = √(ε0*μ0)
A Disruptive Web Presence

Custom Search
Over 10,000 pages indexed! (none duped or pirated)

Read About RF Cafe
Webmaster: Kirt Blattenberger
    KB3UON

RF Cafe Software

RF Cascade Workbook
RF Cascade Workbook is a very extensive system cascaded component Excel workbook that includes the standard Gain, NF, IP2, IP3, Psat calculations, input & output VSWR, noise BW, min/max tolerance, DC power cauculations, graphing of all RF parameters, and has a graphical block diagram tool. An extensive User's Guide is also included. - Only $35.
RF system analysis including
frequency conversion & filters

RF & EE Symbols Word
RF Stencils for Visio

Product & Service Directory
Personally Selected Manufacturers
RF Cafe T-Shirts & Mugs

RF Cafe Software

Calculator Workbook
RF Workbench
Smith Chart™ for Visio
Smith Chart™ for Excel