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4 years ago

Give me three least examples EACH OF PRIMARY AND SECONADRY SOURCES

1 answer:

meriva4 years ago

6 0

Primary Sources :
- Diaries - The Dairy it a Young Girl, Anne Frank *
- Newspaper Article - New York Times : Nixion Resigns
- Political Cartoon - “join or die” *
- Letters - from the past presidents
- Maps
- Speeches - “I had a Dream” *
- Government Documents - “U.S Constitution” *

Secondary Sources:
- Textbooks *
- Hollywood Movies
- Biographies *
- Book Reviews *
- Encyclopedias *
- Magazine Articles *
(* - means best of the examples)

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3 years ago

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learn more: brainly.com/question/12929978?referrer=searchResults

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2 years ago

2 1. Scattering cross-section of acrosol particles is 2.5E-12 m , absorption cross-section is 0.45E- .2 12 m Concentration of pa

Alona [7]

Answer:

$T = 3.23 \times 10^{-83}$

Explanation:

thickness of aerosol layer is 2.5 km

zenith angle is 40 degree

we know that

$\tau = \epsilon_{ext} . h$

where

$\epsilon_{ext} = N.\sigma_{ext}$

$\epsilon_{ext}$ is extinction coefficient

$\sigma_{ext}$ extiction cross section

N = Concentration

$\sigma_{ext} = (2.5 + 0.45)\times 10^{-12} m^2$

$= 2.95 \times 10^{-12} m^2$

$\epsilon_{ext} = 2\times 10^7 \times 2.95 \times 10^{-12} m^2 \times m^{-3}$

$= 5.9 \times 10^{-5} m^{1}$

$\tau = 5.9 \times 10^{-5} m^{-1} \times 2.5\times 10^3 m$

$= 14.75\times 10^{-2}$

transimiitance $T = e^{\frac{-\tau}{\mu}}$

$T = e^{\frac{- 14.75 \times 10^{-2}}{cos 40}}$

$T = 3.23 \times 10^{-83}$

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4 years ago

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