What are 7 elements from the periodic table that are named after objects in outer space

1 answer:

5 0

Helium... from the greek word helios... the sun
selenium... from the greek word selene... the moon 
palladium.. after the asteroid pallas 
tellurium...from the greek word tellus... the earth 
mercury...after the planet mercury 
cerium... after the asteroid ceres 
uranium...after the planet uranus 
neptunium.. after the planet neptune 
plutonium.. after the planet pluto

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An 7.5 × binocular has 3.7-cm-focal-length eyepieces. What is the focal length of the objective lenses? Express your answer to t

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To solve this problem we will apply the concept of magnification, which is given as the relationship between the focal length of the eyepieces and the focal length of the objective. This relationship can be expressed mathematically as,

$\mu = \frac{f_0}{f_e}$

Here,

$\mu$ = Magnification

$f_e$ = Focal length eyepieces

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Rearranging to find the focal length of the objective

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Replacing with our values

$f_0 = 7.5* 3.7cm$

$f_0 = 27.75cm$

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