CHEMISTRY MIDDLE SCHOOL

An AM radio station broadcasts news at 650 kHz. What is the frequency of this radio wave in hertz?

Answers

Answer 1
Answer:

The equivalency of the frequency of the radio wave in Hz is 650 * 10^3 \ Hz.

The frequency of a wave is number of cycles of the wave at a given period of time. The frequency of the wave is directly proportional to the speed of the wave and inversely proportional to the wavelength.

v = f \lambda

where;

v is the speed of the wave

f is the frequency of the wave

λ is the wavelength

The given frequency of the wave = 650 kHz

The equivalency of the frequency of the radio wave in Hz  is calculated as follows;

f = 650 * 10^3 \ Hz

Learn more about frequency of wave here: brainly.com/question/19638389
Answer 2
Answer:

650 KHz means 650 thousand hertz = 650,000 Hertz. If it were an FM station, say at 92.3 MHz, that would be 92.3 Million Hertz or 92,300,000 Hertz. MHz means mega hertz. Mega = Million.

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Which of the following solutions is more dilute?A.The solution with 10 grams of honey and 100 mL of water.
B.The solution with 5 grams of honey and 100 mL of water.
C.The solution with 15 grams of honey and 100 mL of water.
D.The solution with 20grams of honey and 100 mL of water.

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Is 2 pounds bigger than 80 ounces

Answers

no because 2 pounds only equals 16 ounces times 2 so it equals 32 ounces which is not bigger than 80
no because 2 pounds is 16 

During which of the following phases of the moon do we see the left half of the moon as lit? Full moon
First quarter moon
Gibbous moon
Third quarter moon

Any help is greatly appreciated!! :)

Answers

Answer:

The answer is: Can be first quarter moon or third quarter moon.

Explanation:

At first quarter moon and at third quarter moon we can see exactly half of the moon lit up. But, it depends on the place in the planet where you are, which side of the moon you see lit up in which stage of the moon. In the north, the left part of the moon is lit up in third quarter, while in the south is the righ part. An the same for the first quarter, where de right half of the moon is lit up for the north and for the south it is the left. So, the real answer is: For the north part of the world, it will be at third quarter, and for the south part, it will be at first quarter.

The left is seen when the moon is at the third quarter phase

What is a group of electrons orbiting at roughly the same distance from the nucleus

Answers

A shell of electrons.

How do everyday activities like driving a car and using electricity lead to global warming ?

Answers

Both driving a car and using electricity produce several greenhouse gases which can lead to global warming.Greenhouse gases are gases that, when released into the atmosphere, trap the heat from the sun's energy. Every day the energy from the sun reaches the earth. Some of the energy is reflected back into space and some of the energy is trapped by the earth's atmosphere. Most of the time the energy being trapped by the atmosphere serves to warm up the earth, so that the temperature does not fluctuate dramatically. In this way the atmosphere acts like a greenhouse - trapping the warmth in. One of the ways that electricity is made is by burning fossil fuels, like coal or fuel. When a fuel is burnt, some of the products are: carbon dioxide, carbon monoxide, and water - all of these gases are greenhouse gases. In a similar way driving a car also burns fossil fuels, and this will produce the same gases.Before lots of fossil fuels were burnt the greenhouse gases in the atmosphere would have been moderated by the carbon cycle. However, if we burn excess fossil fuels we are producing excess greenhouse gases. This can cause more heat to be trapped by the atmosphere and therefore the global temperature will start to rise - global warming. hope i helped 

The emission of carbon due to excessive burning of fossil fuels for making electricity, driving cars and other things  

An electron in a sodium atom gains enough energy to move from the second shell to the third shell. The sodium atom becomes:(1) a positive ion
(2) a negative ion
(3) an atom in an excited state
(4) an atom in the ground state

Answers

Answer;

-(3) an atom in an excited state

Explanation;

-An electron in a sodium atom gains enough energy to move from the second shell to the third shell. The sodium atom becomes an atom in an excited state.

-Ground state is the lowest allowable energy state of an atom. When electrons are subjected to stimuli like heat, light or electricity an electron may jump to a higher energy level, which is the excited state. Excitation is the elevation in energy level above the baseline energy state.
(3) The atom goes into an excited state.

I say this because since it's moving from the second level to the third, it gains more energy. And it can't be an ion because there are electrons still present in the atom. If the electrons had happened to be removed then it would have been a negative ion.
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