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viktelen [127]
3 years ago
14

Both a siren passing by and radar exhibit the Doppler effect. What is the main

Chemistry
2 answers:
Gemiola [76]3 years ago
5 0

Answer:

D. Radar uses radio, and the siren uses sound waves.

Explanation:

The main difference between the siren passing by and the radar is that radar uses radio waves and siren uses sound waves.

  • Sound waves are mechanical waves which requires a material medium for their propagation.
  • In a vacuum, the sound waves cannot pass through freely.
  • Radar is an electromagnetic wave.
  • It is particular of radio waves origin.
  • Such waves do not require a material medium for their propagation and hence can be transmitted through a vacuum.
Likurg_2 [28]3 years ago
3 0

Answer: c is the correct answer

Explanation:

I’m smrt

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The radioisotope phosphorus-32 is used in tracers for measuring phosphorus uptake by plants. The half-life of phosphorus-32 is 1
Harman [31]

Answer:

54 days

Explanation:

We have to use the formula;

0.693/t1/2 =2.303/t log Ao/A

Where;

t1/2= half-life of phosphorus-32= 14.3 days

t= time taken for the activity to fall to 7.34% of its original value

Ao=initial activity of phosphorus-32

A= activity of phosphorus-32 after a time t

Note that;

A=0.0734Ao (the activity of the sample decreased to 7.34% of the activity of the original sample)

Substituting values;

0.693/14.3 = 2.303/t log Ao/0.0734Ao

0.693/14.3 = 2.303/t log 1/0.0734

0.693/14.3 = 2.6/t

0.048=2.6/t

t= 2.6/0.048

t= 54 days

3 0
2 years ago
How do you balance a chemical equation
Dominik [7]
There should be mass balance and the charge balance between the reactants and the products

Mass balance : total no of individual atoms of each type should be balanced before and after the reaction

Charge balance : Overall charge of the reactants should be balanced with the overall charge of the products

You can balance,

1)by just looking at it

2)by Algebraic method given above or

3)by the redox method

You need to know how to get the oxidation numbers in order to use the oxidation method

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2 years ago
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QveST [7]
Fruits and vegetables are in the produce aisle because they are plants, and plants are producers.
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A neutral atom becomes a positive ion when it
Alexeev081 [22]

Answer:

Neutral atoms can be turned into positively charged ions by removing one or more electrons.

Explanation:

If there is an atom that has 9 protons and 9 electrons, removing an electron from the atom will gain a postive charge.

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The answer would be periods 6-7 :)
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