4 years ago

Give two examples in which the host is harmed.

Chemistry

1 answer:

dexar [7]4 years ago

7 0

Answer:

lice, mosquito

Explanation:

both are examples of parasitism

edit: wait nvm i thought this was bio

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4 years ago

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Excited lithium ions emit radiation at a wavelength of 670.8 nm in the visible range spectrum. Calculate the frequency of a phot

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Answer : The frequency of a photon of radiation is, $4.47\times 10^9s^{-1}$

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Conversion used : $(1nm=10^{-9}m)$

So, the wavelength of the radiation = 670.8 nm = $670.8\times 10^{-9}m$

Now we have to calculate the frequency of a photon of radiation.

Formula used : $\nu =\frac{c}{\lambda}$

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$\nu$ = frequency of a photon of radiation

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Now put all the given values in the above formula, we get the frequency of a photon of radiation.

$\nu =\frac{3\times 10^8m/s}{670.8\times 10^{-9}m}$

$\nu =4.47\times 10^9s^{-1}$

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