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4 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]4 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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Balance the following reaction: NaOH + HCI ->NaCI +H2O

Fiesta28 [93]

The chemical reaction is balanced.

Explanation:

We have the following chemical reaction:

NaOH + HCl → NaCl + H₂O

It is a neutralization reaction between a base and an acid which produce a salt and water.

To balance the chemical reaction the number and type of atoms entering the reaction have to be equal to the number and type of atoms leaving the reaction. We do that to conserve the mass.

We do not need to add other stoechiometric coefficients because the reaction is already balanced.

1 Na atom is entering the reaction and 1 Na atom is leaving the reaction

1 Cl atom is entering the reaction and 1 Cl is leaving the reaction

1 O atom is entering the reaction and 1 O atom is leaving the reaction

2 H atoms are entering the reaction and 2 H atoms are leaving the reaction

Learn more about:

balancing chemical reactions

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3 0

3 years ago

10. For each of the following pairs of ionic compounds, state which would be expected to have the higher (more negative) lattice

zaharov [31]

Answer:

C I belive

Explanation:

7 0

3 years ago

Suppose that you have a 60.0% solution of NaOH. How many milliliters of water must be added to 30.0 mL of this solution to prepa

defon

Answer:

21.4 ml (second choice)

Explanation:

1) Data:

a) C₁ = 60.0% (initial solution)

b) V₁ = 30.0 ml (initial solution)

c) C₂ = 0% (pure water)

d) V₂ = ? (pure water)

e) C₃ = 35.0% (final concentration)

2) Formula:

C₁V₁ + C₂V₂ = C₃V₃
V₁ + V₂ = V₃ (assuming volume addtivity)

3) Solution:

a) Substitute values in the first formula:

60.0% × 30 ml + 0 = 35% (30 ml + V₂)

b) Solve the equation (units are supressed just to manipulate the terms)

18 = 10.5 + 0.35V₂

0.35V₂ = 18 - 10.5 = 7.5

V₂ = 7.5 / 0.35 = 21.4 ml ← answer

3 0

4 years ago

Which body system includes the lungs?m

Zanzabum

Answer: The respiratory system

Explanation: It includes the nose, mouth, throat, voice box, windpipe, and lungs. Air enters the respiratory system through the nose or the mouth.

4 0

3 years ago

Where on the pH scale would you find acids? Bases? What is unique about a pH of 7?

Alex777 [14]

Answer:

Demonstrate familiarity with the pH scale ... body (excluding things like stomach acid) measure around 7.2 and 7.6 on the pH scale (a 7 is neutral on the scale). ... The pH of a solution is a measure of its acidity or alkalinity (base). ... Using a pH meter, you find the pH of an unknown solution to be 8.0.

Explanation:

3 0

3 years ago

Read 2 more answers