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Luda [366]
3 years ago
12

Astronomers use __________ to remotely identify the ________ of an object by the unique pattern of lines in its spectrum.

Biology
2 answers:
tamaranim1 [39]3 years ago
6 0

Answer:

Astronomers use __________ to remotely identify the ________ of an object by the unique pattern of lines in its spectrum.

<u>spectroscopy, </u><u>density✓</u>

cratering, age

radiometric dating, age

spectroscopy, composition

<em>Hope</em><em> this</em><em> helps</em>

Aliun [14]3 years ago
3 0

Answer:Spectroscopy helps astronomers to determine the composition, temperature, density, and motion of an object.

Infrared spectroscopy helps to identify the atoms and molecules in the object.

The red shift or blue shift (Doppler Effect) in a spectral line tells how fast the object is receding from Earth or coming toward it.

The Doppler shift enables astronomers to discover extrasolar planets.

As a planet orbits its star, the star is alternately moving away from or toward us.

Astronomers can use the Doppler shifts to calculate the speed of the star and the mass of the planet that is tugging on it.

Explanation:

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Answer:

A serial dilution and the following plating experiment is done in order to determine the actual amount of bacteria/microbes in a specific volume of soil sample. As a standard test, a set volume of the lower dilution is obtained and positioned on a median plate and permitted to increase for the needed amount of time. The amount of colonies is evaluated and thus the overall Colony Forming Units (CFU) is determined by unit volume of the sample plated and therefore the volume of soil sample employed.

Therefore,

The calculation is done using:

CFU/ml = Number of colonies appeared × dilution factor / volume plated

Given,

Number of colonies appeared = 97

dilution factor = 10^(-6)

volume plated = 1/10 = 0.1

This will help us calculate it as:

CFU/ml = 97 * 10^(-6) / 0.1

= 97 * 10^(-7) CFU/ml

This CFU/ml helps determine the amount of bacterial colonies per unit volume of sample plated.

Given,

The original sample as 1g or 1000 mg of soil in its total volume.

Therefore,

The number of bacteria can be calculated using:

Amount of bacteria in original sample

= 97 * 10^(-7) CFU/ml × 1/ 1000 mg

= 9.7 * 10^(-3) CFU/mg

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3 years ago
A drug that blocks the effects of a neurotransmitter is called a(n) ____.​
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A) agonist is the correct answer
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Answer:

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Explanation:

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