Answers to RF Cafe Quiz #15

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.

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Note: Many answers contain passages quoted in whole or in part from the text.

1. To which constant is

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*10

2. To which constant is

a) base of natural logarithms

e

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

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

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

c) electron rest mass

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

6. To which constant is

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

c) permittivity of free space

This is often written as ε

8. To which constant is

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

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 (N

10. To which constant is

d) permeability of free space

This is often written as μ