helium is in group 8 and period 1
What is the frequency of yellow light, which has a wavelength of 5.56 x 10^-7 m?
O A) 5.40 x 10^14 m/s
O B) 5.40 x 10^14 Hz
O C) 1.85 x 10^15 m/s
O D) 1.85 x 10^15 Hz
The frequency of yellow light, which has a wavelength of 5.56 x 10^-7 m is 5.40 x 10^14 Hz. Therefore, option B is correct.
What do you mean by wavelength ?The distance between identical points (adjacent crests) in adjacent cycles of a waveform signal propagated in space or along a wire is defined as the wavelength. This length is typically specified in wireless systems in meters (m), centimeters (cm), or millimeters (mm) (mm).
The wavelength is the distance between two wave crests, and it is also the distance between two wave troughs. The frequency is measured in cycles per second (Hz) and is the number of vibrations that pass over a given spot in one second (Hertz).
Speed is distance over time, Therefore, v = λ / T.
The frequency, f, is 1/T, so the equation relating wave speed, frequency, and wavelength is v = c / λ .
Given :
Wavelength = 5.56 x 10^-7 m
Frequency = ?
Speed (c) = 3 × 10⁸m/s
v = c / λ
By substituting given values in equation and we get,
v = 3 × 10⁸ / 5.56 x 10^-7
= 5.40 x 10^14
The frequency of yellow light is 5.40 x 10^14.
Thus, option B is correct.
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To make hot cocoa on the trip, you will need to boil water. Construct an
explanation that describes how the lower air pressure in the mountains affects
this process.
i need an answer in under an hour pls help
Answer:
the water in the mountains will take longer to boil, because of the higher atmospheric pressu
Use the periodic table to identify the number of core electrons and the number of valence electrons in each case below.
Can you please add a picture of the case??
Fill in the [?]
1.7 km = [?]m
Give your answer in standard form.
Answer: 1.7 km = [1700]m
1.7 × 10^3
Explanation:
Answer:
1700 meters
Explanation: hope it helps.
What is the correct definition of Earth's energy budget?
it's a balance between that reaches the earth and the sun.
Can I have brainlist please
What is atomic mass? the mass of the atom based on the mass of an atom of hydrogen-1 the mass of an atom based on the mass of an atom of carbon-12 the mass of the atom based on the mass of an atom of oxygen-16 the mass of an atom based on the number of electrons
Answer:
The mass of an atom based on the mass of an atom of carbon-12
Explanation:
Help please, take a screenshot who will answer will be brainiest.
Answer:
1:
•a typical metal tends to have a higher melting and boiling point than a typical non metal which has a low melting and boiling point
•a typical metal tends to have a shiny appearance than a typical non metal which has a dull apearance
•and finally, a typical metal is a good conductor of electricity and heat while a typical non metal isn't
2:
elements E and C
3:
a, it doesn't conduct electricity
b, it's a good conductor of heat/ has a high melting point/ has a high boiling point (you can choose either that sits right with you)
_____ is the tendency of an atom in a compound to attract electrons (F is super attractive and Fr is super unattractive).
The answer is Electronegativity.
A 250. mL sample of oxygen is collected over water at 25 °C and 760.0 torr pressure. What is the partial pressure
of the oxygen? (Vapor pressure of water at 25°C is 23.8 mm Hg)
Answer:The mass of oxygen gas sample collected over water is 0.544 g.
The given parameters;
temperature of the oxygen gas, t = 25 °C
total pressure of the gas, P = 644 torr
volume of the gas, V = 500 mL
vapor pressure = 23.8 torr
molar mass of oxygen gas = 32 g/mol
The number of moles of the gas collected is calculated by using ideal gas equation as follows;
PV = nRT
where;
R is the ideal gas constant = 62.36 L.torr/mol.K
P is the pressure of the gas = 644 torr - 23.8 torr = 620.2 torr
T is the temperature of the gas = 25 + 273 = 298 K
V is the volume of the gas = 500 mL = 0.5 L
The number of moles of the gas is calculated as follows;
The mass of oxygen gas collected is calculated as follows;
m = 0.017 (32 g/mol)
m = 0.544 g
Thus, the mass of oxygen gas sample collected over water is 0.544 g.
Explanation:
The partial pressure of oxygen is; 760.0 torr - 23.8 torr = 736.2 torr.
What is partial pressure?We know that in a mixture of gases, the pressure that is exerted by each gas is called the partial pressure of the mixture.
In this case, we have the total pressure of the mixture as 760.0 torr and the vapor pressure of water as 23.8 mm Hg or 23.8 torr) at that temperature. Hence, the partial pressure of oxygen is; 760.0 torr - 23.8 torr = 736.2 torr.
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Is the following sentence true or false?
The properties of a metal are related to bonds within the metal,
Answer:
True.
Explanation:
In metallic bonds, nuclei of metal atoms line up uniformly and the electrons are delocalized (spread out evenly). Since this allows electrons to move around freely, and electricity is created by the flow of electrons, metals can conduct electricity.
can you write the answer for lot of points
[tex]\\ \sf\longmapsto Work=Force\times Displacement [/tex]
[tex]\\ \sf\longmapsto Force=\dfrac{Work}{Displacement}[/tex]
[tex]\\ \sf\longmapsto Force=\dfrac{2400}{6}[/tex]
[tex]\\ \sf\longmapsto Force=400N[/tex]
Which of the following are required for plants to carry out photosynthesis?
Answer:
To perform photosynthesis, plants need three things: carbon dioxide, water, and sunlight
some macromolecules are polymers. what is a polymer
Answer:
1 marcomolecules are:- A macromolecule is a very large molecule, such as a protein. They are composed of thousands of covalently bonded atoms. Many macromolecules are polymers of smaller molecules called monomers.
2 polymers are:- a natural or artificial chemical compound consisting of large molecules
Explanation:
hope it helps you
How many atoms of lithium are there in 18.2mg of lithium? Dimensional analysis only!
Answer:7.25
Explanation:
This is because 18.2 - 7.2 = 11 +7.2 = 18.2
what are anibiotcs made of
just interested
Answer:
please mark as brainliest
Explanation:
Any substance that inhibits the growth and replication of a bacterium or kills it outright can be called an antibiotic. Antibiotics are a type of antimicrobial designed to target bacterial infections within (or on) the body. This makes antibiotics subtly different from the other main kinds of antimicrobials widely used today:
Antiseptics are used to sterilise surfaces of living tissue when the risk of infection is high, such as during surgery.
Disinfectants are non-selective antimicrobials, killing a wide range of micro-organisms including bacteria. They are used on non-living surfaces, for example in hospitals.
Of course, bacteria are not the only microbes that can be harmful to us. Fungi and viruses can also be a danger to humans, and they are targeted by antifungals and antivirals, respectively. Only substances that target bacteria are called antibiotics, while the name antimicrobial is an umbrella term for anything that inhibits or kills microbial cells including antibiotics, antifungals, antivirals and chemicals such as antiseptics.
Most antibiotics used today are produced in laboratories, but they are often based on compounds scientists have found in nature. Some microbes, for example, produce substances specifically to kill other nearby bacteria in order to gain an advantage when competing for food, water or other limited resources. However, some microbes only produce antibiotics in the laboratory
Answer:
Antibiotics commonly are produced by soil microorganisms and probably represent a means by which organisms in a complex environment, such as soil, control the growth of competing microorganisms. Microorganisms that produce antibiotics useful in preventing or treating disease include the bacteria and the fungi.
Explanation:
source: trust me bro
A student has a sample of ocean water that they take to science class. what steps could be taken to determine to classify the ocean water as a suspension, solution, element, or compound?
A) Examine the pH of the sample. If the pH is exactly neutral, it is a pure substance that is a compound.
B) Evaporate the water. If salt is left behind, the sample is a mixture that can be defined as a solution.
C) Let the sample settle. If the salt settles to the bottom, it is a mixture that is classified as a solution.
D) Observe the diffraction of light as it moved through the sample. If light does not scatter, it is a pure substance that is elemental.
Answer:
A or D because B and C dont make sense
Describe the procedural steps to achieve adequate separation of a homogeneous, liquid mixture containing benzoic acid, n-propylbenzene, and phenol, provided a 4:1 hexane to ethyl acetate solution as the eluent, using Thin Layer Chromatography (TLC).
n-propylbenzene will travel the largest distance because it interacts most effectively with the stationary phase followed by phenol and benzoic acid will travel the least distance because it interacts poorly with the mobile phase.
Thin layer chromatography involves the separation of a mixture using a stationary phase made of silica gel on a glass plate and an appropriate mobile phase. The extent of separation is highly dependent on the magnitude of interaction between the solute and the mobile phase. and stationary phase.
The first step in thin layer chromatography is to make a thin mark at the bottom portion of the plate then spot the plate with the sample. The mobile phase is now introduced into the TLC chamber a little below the mark. The plate is now placed in the stationary phase such that the mark is above the solvent level.
The TLC chamber is now covered and enough time is allowed for separation to occur. The spots can be seen using a suitable indicator dye or with a the aid of UV light
After the separation of a homogeneous, liquid mixture containing benzoic acid, n-propylbenzene, and phenol, provided a 4:1 hexane to ethyl acetate solution as the eluent, we can see that n-propylbenzene will travel the largest distance because it interacts most effectively with the stationary phase followed by phenol and benzoic acid will travel the least distance because it interacts poorly with the mobile phase.
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Can anyone please answer questions 3 and 4
I’ll give the brainiest!
Answer:
1.Phenolphthalein
2.Method
a.Use the pipette and pipette filler to add 25 cm 3 of alkali to a clean conical flask.
b.Add a few drops of indicator and put the conical flask on a white tile.
c.Fill the burette with acid and note the starting volume.
d.Slowly add the acid from the burette to the alkali in the conical flask, swirling to mix.
Explanation:
What is the pressure in millimeters of mercury inside a container of gas.
why are baseballs harder to pick up tennis balls?
Explanation:
Because baseballs are made out of things that make it heavier then tennis balls, easier to play the sport. that's why they use a bat in baseball.
Why can Marco hear the music, even though he is not in the same room as the speaker?
Answer:
Sound Travels
Explanation:
Sound waves can travel, and that makes it so that even though Marco is in a different room, he can hear the music. Depending how loud the music is and how thick the walls car, the sound can travel through the walls.
What would happen if we didn’t have the Milky Way
What is the acceleration of a 10 kg pushed by a 5N force
Answer:
0.5 m/s²Explanation:
The acceleration of an object given it's mass and the force acting on it can be found by using the formula
[tex]a = \frac{f}{m} \\ [/tex]
f is the force
m is the mass
From the question we have
[tex]a = \frac{5}{10} = \frac{1}{2} = 0.5 \\ [/tex]
We have the final answer as
0.5 m/s²Hope this helps you
How can you classify matter?
Answer:
Matter can be broken down into two categories: pure substances and mixtures. Pure substances are further broken down into elements and compounds. Mixtures are physically combined structures that can be separated into their original components. A chemical substance is composed of one type of atom or molecule.
Hope this helps :)
aldosterone plays a primary role in adjustment of ____________ excretion.
If Temperature 25 C and volume is 117.5 cm³. Explain volume temperature relationship using Charles’s law.
(No links or else I'll report.
Don't answer if u dont know.)
Thank You.
Explanation:
According to Charles law : V/T=k (constant).
the volume temperature relationship will be
V/T = 117.5/25 = 4.7
hope this helps you.
_ is the process in which an element spontaneously transforms into another isotope of the same element, or into a different element.
Answer:
Nuclear transmutation
Explanation:
The process in which an element spontaneously transforms into another isotope of the same element, or into a different element is called nuclear transumutation. It occurs when the number of protons or neutrons in the nucleus of an atom is changed.
How to tell if a reaction is exothermic.
Answer:
If the reaction loses heat it is exothermic.
NO LINKS PLEASE!!!
Which picture correctly shows the path of the reflected light ray?
Select one:
a. A
b. B
c. C
d. D
The picture that correctly shows the path of the reflected light ray is: Picture A.
A ray diagram can be defined as the graphical representation of the possible paths that a light wave takes from one point (source) to another.
Basically, some of the phenomenon and properties associated with light ray include the following:
RefractionDiffractionInterferenceReflectionA reflected light ray completely bounces off a surface and as such, light wave do not pass through the surface as illustrated in Picture A.
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After a few minutes of boiling, Francisco removes the pressure cooker from the heat and lets it sit for 15 minutes. How will this affect the particles in the water vapor inside the cooker?
Choose the correct answer.
They will collide with each other more often.
They will collide with the walls of the pressure cooker more often.
They will collide with the walls of the pressure cooker less often.
They will begin to collide with air particles rather than the liquid water particles.
Answer:
Pressure Cooking
Explanation:
Pressure cooking is a very old cooking method that’s experienced a recent resurgence thanks to a new generation of cookers that promise a speedy, set-it-and-forget-it path to dinner. These devices, whether electrical or stovetop, are all much safer than those of decades ago (which tended to explode), with mechanisms to prevent them from accumulating too much pressure. If you read the owner’s manual carefully, however, you’ll still find one important precaution to take when cooking under pressure: adding water. Water and pressure cooking go hand in hand. In fact, it’s water that helps generate the high-pressure environment that makes your food cook faster.
Most pressure cooker instructions state a minimum amount of water required for pressure cooking even a tiny amount of food. Inside the tightly sealed pressure cooker, the water is heated and eventually boils into steam. Since the steam cannot escape, it collects above the food. All those trapped water molecules increase the pressure inside the cooker.
