A blu-ray laser has a wavelength of 405nm. In what region of the electromagnetic spectrum is this radiation? What is its frequency?

Answers

Answer 1

Answer:

It lies in in the visible region.

Frequency: is 7.407 × 10^-14 Hz

[tex]{ \bf{V = f \lambda}} \\ { \tt{3.0 \times {10}^{8} = f \times (405 \times {10}^{ - 9}) }} \\ { \tt{f = 7.407 \times {10}^{14} \: hertz}}[/tex]

Explanation:

V is speed of light.

f is frequency

lambda is the wavelength


Related Questions

Vitamin C is a water-soluble vitamin, so your body doesn't store it. You have to get the required amount from your diet (citrus fruits are a great source!), or you could take a daily vitamin C supplement pill. Vitamin C is ascorbic acid, so to determine how much vitamin C (acid) has been placed in each pill, you could do an acid-base titration. One vitamin C pill was dissolved in water and titrated to an endpoint by 16.00 mL of a 0.447 M solution of NaOH. How many grams of ascorbic acid were there in the pill? (MW of ascorbic acid is 176.1 /mol). Explain and show your work.​

Answers

Answer:

1.26 g

Explanation:

Number of moles of ascorbic acid = concentration × volume

Concentration = 0.447 M

Volume = 16.00 mL

Number of moles = 0.447 × 16/1000

Number of moles = 7.152 × 10^-3 moles

Number of moles= mass/molar mass

Molar mass of ascorbic acid = 176.1 g/mol

Mass = 7.152 × 10^-3 moles × 176.1 g/mol

Mass = 1.26 g

PLZ HELP There are two main ways that organisms reproduce, or make more Individuals of their own kind. Which of the following is true of these two types of reproduction?
A. In one way, two parents are involved. In the other, there is only one parent
B. In reproduction that involves only one parent, the offspring are different from the parent. In reproduction that involves two parents, the offspring receive exact copies of the parents' DNA.
C. In both ways, offspring share characteristics with their parents but are not exactly the same. O
D. In both ways, all offspring are identical to each other but maji different from their parents.​

Answers

Answer:

A

Explanation:

Two parents are involved in Sexual Reproduction but only one is involved in Asexual Reproduction.

Which of the following apply to organic compounds. Select all that apply. Organic compounds cannot be synthesized. Organic compounds contain carbon. All organic compounds are products of living things. Organic compounds can be synthesized. All compounds that contain carbon are organic.

Answers

Answer:

Organic Compounds CAN BE synthesized

Organic Compounds contain Carbon

PLZ HELP ME WITH MY WORK
What is a compound?
A substance that is made from two different metals
B. A substance that cannot be broken into simpler substances
C. A substance that is made using a chemical reaction
D. A substance that can be separated by physical means​

Answers

Answer:

C.

Explanation:

Answer A is incorrect because a compound doesn't have to be made with only metals.

Answer B is incorrect because that is actually the definition of a pure element.

Answer C is correct because to make a compound, there has to be a chemical reaction where bonds are formed and an entirely new substance is created.

Answer D is incorrect because compounds cannot be separated by physical means.

Hope this helps :D

Chemistry!! Help me! And explain step by step!

Answers

1st part is ure answer --> 2M

Given mass -> 58 grams

mass of NaCl -> 58.44 approx -> 58 any

moles given-> 1 moles

[tex]Molarity = \frac{moles}{vol \: in \: lts} [/tex]

[tex]Molarity = \frac{1}{0.5} = \frac{10}{5} \\Molarity = 2M[/tex]

22.5 ml of a 0.200 m HBr solution was added to a 50.00 ml sample of 0.250 m sodium benzoate (NaC7H5O2). Calculate the pH. Benzoic acid has a Ka 6.30 x 10-5.

Answers

In this problem, we need to find the pH of a buffer (pH = 4.45) that is produced by the reaction of strong acids as HBr that reacts with weak bases as NaC₇H₅O₂ producing its weak acid and a salt, as follows:

HBr + NaC₇H₅O₂ → HC₇H₅O₂ + NaBr

If in the reaction, the limiting reactant is the strong acid, we will produce a buffer (The aqueous mixture of a weak acid and its strong base).

Using Henderson-Hasselbalch equation, we can find the pH of this buffer:

[tex]pH = pKa + log \frac{[NaC_7H_5O_2]}{[HC_7H_5O_2]}[/tex]

Where:

pKa is -log Ka = 4.20

[] could be taken as the moles of each species

After the reaction, the moles of HBr = Moles of HC₇H₅O₂ and the remaining moles of NaC₇H₅O₂ = Initial moles of NaC₇H₅O₂ - Moles of HBr.

Moles HBr:

22.5mL = 0.0225L * (0.200mol/L) = 4.5x10⁻³ moles HBr

Moles NaC₇H₅O₂:

50.0mL = 0.0500L * (0.250mol/L) = 0.0125 moles NaC₇H₅O₂

That means the moles after the reaction of the species of the buffer are:

Moles HC₇H₅O₂ = Moles HBr = 4.5x10⁻³ moles

Moles NaC₇H₅O₂ = 0.0125 moles - 4.5x10⁻³ moles = 8.0x10⁻³ moles

Replacing in H-H equation:

[tex]pH = 4.20+ log \frac{[8.0x10^{-3}]}{[4.5x10^{-3}]}[/tex]

pH = 4.45

Learn more about Henderson-Hasselbalch equation in:

https://brainly.com/question/13423434

Convert the following moles to grams :)
1. 2.4 moles sulfur
2. 1.5 moles BeI2
3. 7.5 moles C6H12O6

Answers

Answer:

3

Explanation:

sky is high and I am good.

What is the name for the compound li2so4

Answers

Answer:

Explanation:

Lithium Sulphate

Answer:

Lithium sulfate is a white inorganic salt with the formula Li2SO4. It is the lithium salt of sulfuric acid.

what is the product of SO2+H2O. ​

Answers

Answer:

H2O + SO2 → H2SO3

Explanation:

H2O + SO2 → H2SO3

Answer:

l think this is the answer .

What’s the name of this compound?

Answers

The name of the compound is Methylidyne radical.

what is precipitating ???


anyone please tell me how to delete an I'd ​

Answers

Explanation:

Desposition of solid matter in a solution

Convert 16.7 inches to yards (there are 3 feet in a yard)
Using the method of dimensional analysis

Answers

Answer:

Explanation:

16.7 inches [1 foot / 12 inches] [1 yard / 3 feet] Notice how the units cancel each other out. You do have numbers in the denominator. What you get, looks like this

16.7

------

(12 * 3)

16.7 / 36

0.4639 yrds

What is the solubility of salt at 60°C if 2 gm of the salt is left behind when 7 gm of its saturated solution at that temperature dried?
a) 20
b) 40
c) 60
d) 80 ​

Answers

40

Explanation:

because its Saturated

how do i know if a salt is insouble or soluble?
[preparations of salts]

Answers

Answer:

by the expirement:

In which mix salt with water

Hiii !! Sooo salt is indeed soluble because it does dissolve whenever it’s mixed in a liquid. Hope it helps :) !!

If we shake the branches of the tree the fruits fall.why?​

Answers

Answer:

When we shake the branch of a tree the tree possesses a state of motion whereas the fruits and leaves tend to remain in state of rest. Due to this inertia of rest the fruits and leaves get detached from the branch and because of gravity it falls down.

Explanation:

so it's because of the gravity .

steel cranes can carry heavy steel beams thousands of feet high

Answers

Answer:

yes they were made to carry thousands of lb high up

how would you detect sulphur in organic compounds​

Answers

Answer:

sodium fusion is changed to sodium sulphide if sulphur is present in the compound

explain the importance of measurement in our daily life​

Answers

Measurements play an important role in our daily lives because they are helpful to complete our daily tasks without difficulty. Things such as measuring medicine, making time estimations, and find weights, areas and volumes of different materials or substances, are all simpler with measurements.

Convert 25 yards to inches
using the method of dimensional analysis

Answers

Answer:

Explanation:

25 yard [3 feet / 1 yard] [12 inches / 1 foot] = 25 * 3 * 12 = 900 inches in 25 yards.

Always put the unit you are going to on top and the unit you are coming from on the bottom.

So in this example, you want to going to feet to start with. That's on top. Yards are on the bottom of the first bracket.  In second bracket feet are on the bottom, inches are what you are going to on the top.

can you solve this science question ⁉️​

Answers

Answer:

chemical reaction between those a b c it's a reaction which occurs when heating

3. What would be the freezing point for a 5.7 molal aqueous sucrose (C12H22O) solution? The freezing
point depression constant for water = 1.86°C/m. Show your work.

Answers

Answer:

- 10.6° C

Explanation:

Given that,

In the aqueous sucrose solution,

Molality of the solution (m) = 5.7

Freezing point constant (K) = 1.86

To find,

The freezing point of the solution = ?

Method:

To find its freezing point, we will first find out if the solute demonstrates an electrolyte or not.

In case it is not, the van't Hoff factor i.e. ration of particles' concentration denoted by (i) would be taken as 1. So,

ΔT(change in temperature) = i * m * K              (putting the given values)

= 1 * 5.7 * 1.86

= 10.6° C

Thus, the freezing point equals to 0 - 10.6° C = -10.6° C.

Potassium impart purple colour but beryllium do not impart any colour to the flame.Why?​

Answers

Answer:

The electrons in beryllium and magnesium are too strongly bound to get excited by flame. Hence, these elements do not impart any color.

what more accurate model of the atom emerged from Albert Einstein's contributions and quantum mechanics

Answers

Answer:

Einstein also in 1905 mathematically proved the existence of atoms, and thus helped revolutionize all the sciences through the use of statistics and probability. Atomic theory says that any liquid is made up of molecules (invisible in 1905)

Explanation:

Answer:

The discoveries of Albert Einstein led to development in the understanding of the atom through the study of quantum mechanics and the electron cloud. In this model, there is still a nucleus with protons and neutrons. But unlike the Bohr model, the electrons exist in a cloud outside the nucleus, much like the fruit around the pit of a peach.

Explanation:

Which element would have the lowest electronegativity? (1 point)
O an element with a small number of valence electrons and a small atomic radius
O an element with a small number of valence electrons and a large atomic radius
an element with a large number of valence electrons and a large atomic radius
Dan element with a large number of valence electrons and a small atomic radius

Answers

The element that will have the lowest electronegativity is an element with a small number of valence electrons and a large atomic radius.

Electronegativity of an element is the ability or power of that element in a molecule to attract electrons to its Valence electrons.  The following are the properties of electronegativity:

It increases across a period from left to right of the periodic table,It decreases down the periodic table groupsGroup 1 elements are the least (lowest) electronegative elements. These elements have the lowest valence electrons with a large atomic radius. Group 7 elements are the most electronegative elements.

Atomic radius of elements increase down a group because of a progressive increase in the number of shells occupied by electrons which increases the size. But it decreases across a period because electrons are accommodated within the same shell leading to greater attraction by the protons in the nucleus.

Learn more about electronegativity of elements here:

https://brainly.com/question/20348681

Answer: Its B the guy above me is correct

please answer this questions soon

i will mark him or her brillient

Answers

Answer:

1)Or

d.Sublimation

2)

b.iodine is the solute and alcohol is solvent

3)

a.compostion of solute

Answer:

1) a) centrifugation

OR

b) sublimation

2) a) iodine is the solute and alcohol is solvent

3) a) concentration of soLute

I need help with question 2

Answers

Answer:

here's the answer to your question

hii pls help me to balance the equation thanksss​

Answers

Explanation:

2KCLO3 (s) = 2KCl (s) + 3O2 (g)

13. Water is a polar compound because it exhibits _______
charges.
O A. negative
O B. positive
O C. opposite
D. neutral

Answers

Answer:

Opposite.

Water exhibits negative charge near hydrogen, positive near oxygen.

This is why it is OPPOSITE.

Let me know if this helps!

Water is a polar compound because it exhibits opposite charges. Therefore, option C is correct.

What is polar compound ?

The term polar compound is defined as the compound with distinct regions of positive and negative charge, as a result of bonding with atoms such as nitrogen, oxygen, or sulfur.

Water is a polar compound because the covalent bonds between hydrogen and oxygen in the water molecule are polar in nature. Any molecule with lone pairs of electrons around the central atom is polar compound.

In water there are two atoms are present that are oxygen and hydrogen. Hydrogen has positive charge while oxygen has negative charge,

Thus, Water is a polar compound because it exhibits opposite charges, option C is correct.

To learn more about the polar compound, follow the link;

https://brainly.com/question/14752836

#SPJ2

Which of the following is not a result of surface tension in water?

a. water has an unusually low vapor pressure
b. drops tend to become spherical
c. surface area is maximized
d. surface appears to have a “skin”

Answers

The option which isn't a result of surface tension in water is: c. surface area is maximized.

Water can be defined as a liquid molecule that comprises the chemical element hydrogen and oxygen in the ratio of two to one (2:1).

Surface tension can be defined as a property of liquid such as water, which makes its surface to resist an external force due to the cohesive nature of its molecules.

This ultimately implies that, the surface tension of a liquid is mainly as a result of the cohesive forces existing between its molecules.

Generally, the surface tension of water is typically higher than the surface tension of most liquids.

Due to the effect of surface tension in water;

Water has an unusually low vapor pressure due to the hydrogen bond between its molecules.Drops of liquids such as water tend to become spherical.The surface of a liquid such as water appears to have a “skin”

Additionally, the surface tension of a liquid such as water can be described as an inward force which tends to minimize its surface area rather than maximize its surface area.

In conclusion, surface tension in water doesn't maximize its surface area.

Find more information: https://brainly.com/question/11348644

According to the law of conservation of energy, what will most likely happen in a closed system?

Answers

Answer:

It is right or wrong I cannot say if it is wrong forgive me.

Answer:

The energy in the system will likely be exchanged, but the matter will not be exchanged.

Explanation:

According to the first law of thermodynamics, also known as Law of Conservation of Energy, energy can neither be created nor destroyed; energy can only be transferred or changed from one form to another. The law of conservation of mass also states that for any system closed to all transfers of matter and energy, the mass of the system must remain constant over time, as the system's mass cannot change.

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