Chemistry High School

A laser used in eye surgery to fuse detached retinas produces radiation with a wavelength of 6.4 x 10^-7 m. What is the frequency of the laser?
Speed of light = 3.00 x 10^8 m/s

(Hint: Remember to round your answer to the lowest number of significant figures.)

(Speed of light) / (Wavelength) = Frequency

show steps please.

Answers

Answer 1

Answer:

ν ≈ 4.7 × 10¹⁴ Hz

General Formulas and Concepts:

Chem

Speed of Light = Wavelength times Frequency

c = λν c = 3.0 × 10⁸ m/s

Explanation:

Step 1: Define

λ = 6.4 × 10⁻⁷ m

Step 2: Solve for ν

3.0 × 10⁸ = 6.4 × 10⁻⁷ · ν

ν = 4.6875 × 10¹⁴ Hz

Step 3: Check

We are given 2 sig figs. Follow sig fig rules.

4.6875 × 10¹⁴ Hz ≈ 4.7 × 10¹⁴ Hz

Related Questions

POSSIBLE POINTS: 1

Please read the example carefully and choose the best answer below.

Marie notices that the current cleaner she is using on her shower is not cutting through the hard water build-

up that has accumulated. She decides to purchase 3 other cleaners to see if one of them will do a better job

of cutting through the stains. Marie places masking tape in the dry shower to create 5 sections for her

experiment. She sprays 3 squirts of one cleaner per section and leaves the remaining section untouched to

compare her results. After 30 minutes, and without scrubbing any of the cleaner in, she records her

observations.

In this example what is the independent variable?

Answers

Answer:

CLEANER

Explanation:

Independent variable is the variable in an experiment that is changed or manipulated by the experimenter in order to bring about a measurable response.

In this question, Marie notices that the current cleaner she is using on her shower is not cutting through the hard water build-up that has accumulated. She decides to purchase 3 other cleaners to see if one of them will do a better job of cutting through the stains. The CLEANERS being changed in this experiment is the INDEPENDENT VARIABLE.

HELPP ME

express with equations the transformations marked on the scheme

Answers

Further explanation

The reaction equation is the chemical formula of reagents and product substances

A reaction coefficient is a number in the chemical formula of a substance involved in the reaction equation. The reaction coefficient is useful for equalizing reagents and products.

Transformations :

1. CaO + H₂O⇒Ca(OH)₂

2. CaO + CO₂⇒CaCO₃

3. Ca(OH)₂+ 2HCl⇒CaCl₂+2H₂O

4. Ca(OH)₂+H₂CO₃⇒CaCO₃+2H₂O

5. CaCO₃⇒CaO+CO₂

what do you conclude from the bar graph

Answers

Answer:

A bar graph shows the relationship between different values of data. Each data value is represented by a column in the graph.

How many moles are there in 3.612 x 1024 formula units of Na2SO4?

Answers

Answer:

Theanswer is 6 moles

Explanation:

To find the number of moles in a substance given it's number of entities we use the formula

[tex]n = \frac{N}{L} \\ [/tex]

where n is the number of moles

N is the number of entities

L is the Avogadro's constant which is

6.02 × 10²³ entities

From the question we have

[tex]n = \frac{3.612 \times {10}^{24} }{6.02 \times {10}^{23} } \\ [/tex]

We have the final answer as

6 moles

Hope this helps you

Substance
Formula
Mass,
(g)
Physical Color
State
Density Boiling
, (g/cm) Point,
Methane
сн.
16.0
Gas
Colorless
0.423
-161.5
Ammonia
NH,
17.0
Gas
Colorless
0.70
-33
Unknown
???
???
???
???
???
???
Propane
CH
44.1
Gas
Colorless
0.493
-12.1
Bromine
Br.
159.8
Liquid
Red
4.04
58.8
Lithium
Li
6.94
Solid
0.534
1342
Silvery,
white
metal
Magnesium Mg
24.3
Solid
1.74
1090
Silver,
white
metal

Answers

Answer:what are u asking to do?

Explanation:

What is the Molecular mass of sodiumcholoride ?

Answers

Answer:

58.5g/mol

Explanation:

Given substance:

Sodium chloride = NaCl

Unknown:

Molecular mass = ?

Solution:

The molecular mass of a compound is the gram-formula mass or gram-molecular weight of the compound.

It is determined by adding its component atomic masses and then express in grams per mole;

Atomic mass of Na = 23g

Atomic mass of Cl = 35.5g

NaCl = 23 + 35.5 = 58.5g/mol

Identify the following examples as either physical or chemical change.
(Ill give brainliest if right)

Answers

Answer:

7. Chemical

8. Chemical

9. Physical

10. Physical

11. Physical

12. Physical

Explanation:

PLEASE HELP!!!!! NEED HELP ASAP!!!!!

Write the chemical formula for the ionic compounds below
EXAMPLE- Calcium Phosphide= Ca3P2

Magnesium chloride=
Aluminum Fluoride=
Lithium Bromide=
Potassium Sulfide=

Answers

Answer:

down below

Explanation:

MgCl2

AlF3

LiBr

K2S

Which of these elements is the most chemically reactive?
A zinc (Zn)
B. iron (Fe)
C. potassium (K)
D. germanium (Ge)

Answers

Answer:

a zinc is the most reactive

Urgent !!!!!!!!!! Due today plzzzzz help me

Answers

Answer:

Explanation:

a. H3O+

b. H3O+

c. CH3C(OH2)+

Suggest a change of state, other than ice melting, that is an endothermic
process.

Answers

Answer:

Vaporization and Sublimation

Explanation:

Answer:

Well there's solid states, liquid states, and gas states in matter.

PLEASE HELP!! WILL GIVE BRAINLIEST!!! I NEED ANSWER QUICKLY!!!

Check the correct box to describe the periodic trends in electronegativity.

Electronegativity across a period:
decreases.
increases.

Electronegativity down a group:

decreases.

increases.

Answers

Electronegativity across a period: increases.

Electronegativity down a group: decreases.

Explanation:

Just did on Edge 2021

Electronegativity across a period increases and Electronegativity down a group decreases.

What is Electronegativity ?

Electronegativity, symbolized as χ, is the tendency for an atom of a given chemical element to attract shared electrons when forming a chemical bond.

An atom's electronegativity is affected by both its atomic number and the distance at which its valence electrons reside from the charged nucleus.

On the periodic table, electronegativity generally increases as we move from left to right across a period and decreases as you move down a group.

As a result, the most electronegative elements are found on the top right of the periodic table, while the least electronegative elements are found on the bottom left.

Hence, Electronegativity across a period increases and Electronegativity down a group decreases.

Learn more about Electronegativity here :

https://brainly.com/question/17762711

#SPJ2

P4 (s) + Cl2 (g) → 4PCl3 (l)

Answers

If you are wanting the equation to be balanced it would be: P4 + 6Cl2 → 4PCl3

WILL MARK YOU BRAINLEIST What do sound waves need to have to travel from one place to another?

What do sound waves need to have to travel from one place to another?

Question 5 options:

steel

water

air

a medium

Answers

THE ANSWER ABOVE IS INCORRECT!! The right answer would be a medium!

Answer:

a medium!!!!

Explanation:

ITS CORRECT!!!! I GOT IT RIGHT ON MY TESTTTTT! I PROMISEEE

is soil a pure or impure substance?

Answers

Impure substance, because pure would be dirt from the earth

Soil is a impure substance

How does the circulatory system work at the tissue level?

Answers

Answer:

Answer. Answer: The circulatory system is a network consisting of blood, blood vessels, and the heart. This network supplies tissues in the body with oxygen and other nutrients, transports hormones, and removes unnecessary waste products.

Explanation:

Answer:

ME AND YOU HAVE THE SAMEEEE USER BUT LOOK

The circulatory system is a network consisting of blood, blood vessels, and the heart. This network supplies tissues in the body with oxygen and other nutrients, transports hormones, and removes unnecessary waste products.

Explanation:

Select the correct answer. Which substance is made of polymers? A. marble B. protein C. salt D. steel

Answers

Answer:

the answer is B proteins

Explanation:

brainliest pls

Answer:

B. protein

Explanation:

A polymer is defined as a molecule which has 'n' number of monomer units.

Similarly proteins are also polymers as they are made up of amino acids and contain a number of repeated units just like polymers.

What is the connection between the Bohr Model and Atomic emission spectra of elements?

Answers

Explanation:

electrons move arround nucleus in the orbit such as sun in suria system..

According to Bohr's model, an electron would absorb energy in the form of photons to get excited to a higher energy level as long as the photon's energy was equal to the energy difference between the initial and final energy levels.

1. What is the name of the ion formed from the sulfur atom?
Sulfuride
Sulfurous
Sulfur
Sulfide

2. Which of the following elements does not form an ion with a charge of +1
A:Sodium
B:Fluoride
C;Potassium
D:Hydrogen

3. The chemical properties of an element are largely determined by____
A:The number of valence electrons they have
B:The number of total protons the element has
C:The number of total ions the element has
D:The number of total electrons the element has

5. How does magnesium obey the octet rule when reacting to form compounds?
A. It gives up electrons
B. Magnesium does not obey the octet rule.
C. It gains electrons
D. It does not change its number of electrons

6. How many electrons does strontium have to give up to achieve a noble gas electron configuration?
0
1
2
3

Answers

Answer:

1 sulfide

2 Fluoride

3 A

5 A

6 2

Which element below is Shiny, good conductor of heat and electricity, malleable and ductile? *
1 point
Chlorine
Nitrogen
Magnesium
Neon

Answers

Answer:

magnesium

Explanation:

it is the only metal in the choices. everything else is on the right side of the old line that separates metals and nonmetals on the PPT. nonmetals aren't, shiny or good conductors or malleable or ductile. only metals can have those qualities. the only metal is magnesium

How many grams are in a sample of 0.55 mol of K?

Answers

The equation you use here is
mass =moles x Mr

So:
Moles of K - 0.55mol
Mr of K - 39.1

Mass= 0.55x39.1 =21.505g

which of the following is the name given to the pairs of valence electrons that do not participate in bonding in diatomic oxygen molecule? A. unvalenced pair B. outer pair C. inner pair D. unshared pair

Answers

The answer to your question is

D: Unshared Pair

Hope this helps you :))))

The name given to the pairs of valence electrons that do not participate in bonding in diatomic oxygen molecule is called Unshared pair

Unshared pair of electrons are also called Free radicals, lone pair or non bonding pairs, they refer to electrons that do not take part in covalent bonding of molecules.

Unshared pair together with shared pair occupy the valence electron shell and make up the valence electrons.

Diatomic oxygen molecule has 4 pair of unshared electrons

See more here: https://brainly.com/question/15451932

2. The ions in an ionic compound separate from each other when
A. dissolved in water
B. when melted
C. when conducting electricity
D. never

Answers

Answer:

A. when dissolved in water

Explanation:

Water is an extremely polar molecule, meaning it has a positive end a negative end. When an ionic compound is dissolved, the positive pole of water will be attracted to the negative ion and attach itself to it. The same goes for the positive ions. That's how water breaks down ionic compounds

Answer:

ions do separate in an ionic compound because there is the free flow of electrons in the oppositely charged ions and conducts electricity in an aqueous form

HELLLLPPPPPPP
Which of the following is the correct term for the chemical reaction that forms polymers?
A. Displacement
B. Oxidation
C. Polymerization
D. Monomerization

Answers

C. polymerization....

What are the names, symbols, and atomic numbers of the nonmetal elements that are NOT gasses?

Answers

Seventeen elements are generally classified as nonmetals: most are gases (hydrogen, helium, nitrogen, oxygen, fluorine, neon, chlorine, argon, krypton, xenon and radon);

one is a liquid (bromine); and a few are solids (carbon, phosphorus, sulfur, selenium, and iodine). Metalloids such as boron, silicon, and germanium are sometimes counted as nonmetals.

ANSWER:

Liquid:
Bromine - Br - 35

Solid:
Carbon - C - 6
Phosphorus - P - 15
Sulfur - S - 16
Selenium - Se - 34
Iodine - I - 53

El plomo y el yodo forman dos compuestos. En uno, el porcentaje de en masa de plomo es del 44,94% y en el otro es de 62,02%. Calcula los gramos de plomo por gramos de yodo en cada compuesto

Answers

Answer:

0.8162 gramos de plomo por gramo de yodo

1.633 gramos de plomo por gramo de yodo

Explanation:

Asumiendo una base de 100 gramos para cada compuesto:

Primer compuesto:

Gramos plomo: 44.94g

Gramos de yodo: 100-44.94g = 55.06g

Así, la masa de plomo por gramos de yodo para el primer compuesto es:

44.94g plomo / 55.06g Yodo =

0.8162 gramos de plomo por gramo de yodo

Segundo compuesto:

Gramos plomo: 62.02g

Gramos de yodo: 100-62.02g = 37.98g

La masa de plomo por gramos de yodo para el segundo compuesto es:

62.02g plomo / 37.98g Yodo =

1.633 gramos de plomo por gramo de yodo

What does an increase of 1 pH number represent?

Answers

Answer:

A one-point pH change indicates the strength of the acid or base has increased or decreased tenfold; a 2-point change indicates a 100-fold change in acidity or alkalinity, and a 3-point change in pH indicates a 1000-fold change. Examples: • An increase in pH from 7.0 to 8.0 means the water is 10 times more basic.

Explanation:

Describe a gentle force?

Answers

Answer:

The word gentle traces back to the Latin word gentlis, meaning “of the same clan,” and at first the world was used to describe people belonging to distinguished families, who were seen as courteous and noble. Nowadays you’re more likely to hear the word used to refer to things that are calm, moderate, and without harshness. The word is often applied to people, but it can be used more broadly to describe anything that is mild, such as "a gentle detergent" or "a gentle reminder."

An example of a decomposer is a:

rabbit
mushroom
tulip

Answers

Answer:

mushroom

Explanation:

Where do convection currents occur?
A.
In areas with the same temperature
B.
In areas with different air pressures
C.
In areas with the same altitude
D.
In areas with different cloud types

Answers

Answer:

a because where the air travels for example a radiator

Answer:

In areas with the same altitude

Explanation:

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