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3 years ago

Explain the Doppler effect using light. Why is the Doppler effect important in astronomy?

2 answers:

8 0

Doppler effect is the compression or extension of a sound wave, which causes a change in its wavelength / frequency (and so its sound).
Explanation: It is defined as the effect produced by a moving source of waves in which there is an upward shift in frequency for observers, the source is moving towards and downward shift of frequency from which the source is moving away. used to tell if an object in space is moving toward or away from us.

USPshnik [31]3 years ago

6 0

Answer:

When a star is moving away the light looks red or redder. And when a star is moving toward you it is blue or bluer. This is important because you can tell which way the star is moving.

Explanation:

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A compound contains only nitrogen and oxygen and is 30.5% nitrogen by mass. A gaseous sample of the compound has a density of 3.

MariettaO [177]

Answer : The molecular formula of the compound will be, $NO_4$

Explanation:

First we have to calculate the mass of nitrogen and oxygen.

As we are given that 30.5 % nitrogen by mass that means 30.5 g of nitrogen present in 100 g of solution.

Mass of nitrogen = 30.5 g

Mass of oxygen = Mass of solution - Mass of nitrogen

Mass of oxygen = 100 g - 30.5 g

Mass of oxygen = 69.5 g

To formulate the empirical formula, we need to follow some steps:

Step 1: Converting the given masses into moles.

Moles of N = $\frac{\text{Given mass of N}}{\text{Molar mass of N}}=\frac{30.5g}{28g/mole}=1.09moles$

Moles of O = $\frac{\text{Given mass of O}}{\text{Molar mass of O}}=\frac{69.5g}{16g/mole}=4.34moles$

Step 2: Calculating the mole ratio of the given elements.

For the mole ratio, we divide each value of the moles by the smallest number of moles calculated which is 1.09 moles.

For N = $\frac{1.09}{1.09}=1$

For O = $\frac{4.34}{1.09}=3.98\approx 4$

Step 3: Taking the mole ratio as their subscripts.

The ratio of N : O = 1 : 4

Hence, the empirical formula for the given compound is $NO_4$

The empirical mass of given compound is $NO_4$ = 1(28) + 4(16) = 92 g/eq

To calculate the molecular mass of compound we are using ideal gas equation:

$PV=nRT\\\\PV=\frac{w}{M}RT\\\\P=\frac{w}{V}\\times \frac{RT}{M}\\\\P=\rho \frac{RT}{M}$

where,

P = pressure of gas = 924 torr = 1.216 atm

Conversion used : (1 atm = 760 torr)

T = temperature of gas = $105^oC=273+105=378K$

R = gas constant = 0.0821 L.atm/mole.K

$\rho$ = density of gas = 3.61 g/L

M = molar mass of gas = ?

Now put all the given values in the ideal gas equation, we get:

$(1.216atm)=3.61g/L\times \frac{(0.0821L.atm/mole.K)\times (378K)}{M}$

$M=92.1g/mol$

Now we have to calculate the molecular formula of the compound.

The equation used to calculate the valency is :

$n=\frac{\text{molecular mass}}{\text{empirical mass}}$

$n=\frac{92.1}{92}=1$

Molecular formula = $(NO_4)_n=(NO_4)_1=NO_4$

Thus, the molecular formula of the compound will be, $NO_4$

4 0

4 years ago

Write the equation for a rn-224 atom undergoing 1 beta decay: what is the daughter?

gayaneshka [121]

Answer:

Rn-224 --> Fr-224 + beta

Explanation:

When an isotope of radon 224 undergoes a radioactive decay by emitting a beta particle, an isotope of francium 224 is obtained.

Remember that the first letter of a chemical symbol is written with a capital letter .

Radon: Rn

Francium: Fr

success with your homework

7 0

3 years ago

This is the picture answer this plsss..

Ulleksa [173]

Answer:

he is a weelder because of him taking a peice of metal and recreateing it.

Explanation:

3 0

3 years ago

When 20 grams of KCIO3, is dissolved in 100 grams of water, the solution can be

tia_tia [17]

Answer:

b. unsaturated .

Explanation:

Hello there!

In this case, according to the given information, it turns out necessary for us to bear to mind the definition of each type of solution:

- Supersaturated solution: comprises a large amount of solute at a temperature at which it will be able to crystalize upon standing.

- Unsaturated solution: is a solution in which a solvent is able to dissolve any more solute at a given temperature.

- Saturated solution can be defined as a solution in which a solvent is not capable of dissolving any more solute at a given temperature.

In such a way, since 20 grams of the solute are less than the solubility, we infer this is b. unsaturated, as 33.3 grams of solute can be further added to the 100 grams of water.

Regards!

6 0

3 years ago

What are the periodic trends of ionic radii? Check all that apply.

Troyanec [42]

Atomic radii increase when going down a group and decreases when going towards the anion periods. So A and D.

6 0

3 years ago

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