Zinc selenide has a band gap of 2.58 eV. Over what range of wavelengths of visible light is it transparent

A more reactive metal will displace a less reactive metal from a compound. ... Because aluminum is more reactive than iron, it displaces iron from iron(III) oxide. The aluminum removes oxygen from the iron(III) oxide: iron is reduced.

A more reactive metal will displace a less reactive metal from a compound because aluminum is more reactive than iron, it displaces iron from iron(III) oxide.

Compound has been combination of two or more than two different elements which are said to be chemically bond. So the compound has to be held by the chemical bond. A compound cannot be separate by the physical separation and after that the mixture you cannot be identified that it has compound or not.

Mixture has been combination of the two or more than different chemical elements which has not chemically bond. A mixture has been the physical combination of two or more elements in which the individual identities are remained and it also mixed by the solutions, suspension and colloids.

A compound cannot be separate by the physical separation and after that the mixture you cannot be identified that it has compound or not.Mixture has been combination of the two or more than different chemical elements which has not chemically bond.

Therefore, A more reactive metal will displace a less reactive metal from a compound because aluminum is more reactive than iron, it displaces iron from iron(III) oxide.

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Answer:

A

Explanation:

Yw :)

Answer:

a

Explanation:

Answer:

I think the  answer is frequency

Answer:

wAvE

Explanation:

i have my ways

(a) Without friction, Newton's second law tells us the net horizontal force is such that

28 N = (5 kg) a

a = (28 N) / (5 kg)

a = 5.6 m/s²

(b) With friction (magnitude f ), we get a net horizontal force such that

28 N - f = (5 kg) a

and a net vertical force such that

n - w = 0

since the block is only being pulled horizontally, where w is the weight of the block and n is the magnitude of the normal force. So

n = w = (5 kg) (9.8 m/s²)

n = 49 N

Friction is proportional to the normal force such that

f = µ n

We're given µ = 0.23, so

f = 0.23 (49 N)

f ≈ 11 N

Solve for a :

28 N - 11 N = (5 kg) a

a = (17 N) / (5 kg)

a = 3.4 m/s²

Answer:

0.03

Explanation:

Answer: Melting

Explanation:

When Frieda made a pyramid of marshmallows, she was representing the atoms in a solid substance as the atoms are clumped together and unable to move.

When she then knocks it down, she is showing the movement of atoms in a liquid substance as they are now freer than they were before. The process by which substances go from solid to liquid is melting.

Answer: Melting

Explanation: When Frieda made a pyramid of marshmallows, she was representing the atoms in a solid substance as the atoms are clumped together and unable to move.

When she then knocks it down, she is showing the movement of atoms in a liquid substance as they are now freer than they were before. The process by which substances go from solid to liquid is melting.

dyed I don't it sorryvplss

Answer:

you need to attach a picture so I can answer it

Answer:

a

Explanation:

Answer:

The electric field strength is equal to 2.50 newtons per coulomb at a distance of 2 meters.

Explanation:

From Classic Electrostatic Theory, we find that electric field ([tex]E[/tex]), measured in newtons per coulomb, is defined by the following equation:

[tex]E = \frac{F}{q_{O}}[/tex] (1)

Where:

[tex]F[/tex] - Electrostatic force, measured in newtons.

[tex]q_{O}[/tex] - Electric charge, measured in coulombs.

In addition and supposing that phenomena occurs between particles, electrostatic force is modelled after the Coulomb's Law:

[tex]F = \frac{k\cdot q\cdot q_{O}}{r^{2}}[/tex] (2)

Where:

[tex]k[/tex] - Electromagnetic constant, measured in newton-square meters per square coulomb.

[tex]q[/tex], [tex]q_{O}[/tex] - Electric charges, measured in coulomb.

[tex]r[/tex] - Distance between particles, measured in meters.

By applying (2) in (1), we get the following definition of electric field:

[tex]E = \frac{k\cdot q}{r^{2}}[/tex] (3)

Then, we observe that electric field is inversely proportional to the square of the distance. The following relationship is therefore constructed:

[tex]\frac{E_{2}}{E_{1}} = \left(\frac{r_{1}}{r_{2}} \right)^{2}[/tex] (4)

If we know that [tex]E_{1} = 10\,\frac{N}{C}[/tex], [tex]E_{2} = 2.50\,\frac{N}{C}[/tex] and [tex]r_{1} = 1\,m[/tex], then the distance is:

[tex]\left(\frac{E_{2}}{E_{1}} \right)\cdot r_{2}^{2}= r_{1}^{2}[/tex]

[tex]r_{2}^{2}=\left(\frac{E_{1}}{E_{2}} \right)\cdot r_{1}^{2}[/tex]

[tex]r_{2} = r_{1}\cdot \sqrt{\frac{E_{1}}{E_{2}} }[/tex]

[tex]r_{2} = (1\,m)\cdot \sqrt{\frac{10\,\frac{N}{C} }{2.50\,\frac{N}{C} } }[/tex]

[tex]r_{2} = 2\,m[/tex]

The electric field strength is equal to 2.50 newtons per coulomb at a distance of 2 meters.

Answer:

True

Explanation:

Different colors of light travel at greatly different speeds even in the same medium. This is what causes the dispersion of light through a prism.

Answer:Its false just took the test.

Explanation:

Answer:

HEY PLS LISTEN THERE IS A GUY GOING AROUND TELLING GIRLS TO JOIN HIS ZOOM ON BRAINLY AND MAKING ACCS AND STUFF TO MAKE PEOPLE JOIN HIS ZOOM.THE CODE IS 387 187 6280 HES A PEDXO AND TELLING GIRLS TO SHOW THERE BODIES TO HIM. SO PLEASE BE AWARE! COPY AND PASTE THIS TO SPREAD THE WORD!

Explanation:

HEY PLS LISTEN THERE IS A GUY GOING AROUND TELLING GIRLS TO JOIN HIS ZOOM ON BRAINLY AND MAKING ACCS AND STUFF TO MAKE PEOPLE JOIN HIS ZOOM.THE CODE IS 387 187 6280 HES A PEDXO AND TELLING GIRLS TO SHOW THERE BODIES TO HIM. SO PLEASE BE AWARE! COPY AND PASTE THIS TO SPREAD THE WORD!

Icecaps and Glaciers

Explanation:

Icecaps and Glaciers hold 68 percent of fresh water on earth :)

Answer:

Star 1 2 hours

35

Explanation:

Answer:

the answer would be 35 degrees :))))

Explanation:

it was the correct on the quiz,,, good luckk :3!!

Answer:

c

and d

Explanation:

Answer:

Work function, [tex]W=5.83\times 10^{-19}\ J[/tex]

Explanation:

Given that,

Frequency of light, [tex]f=2.11\times 10^{-15}\ Hz[/tex]

Kinetic energy of the ejected electrons, [tex]E_k=5.83\times 10^{-19}\ J[/tex]

We need to find the work function of the gold. Let it is W.

Using Einstein's photoelectric equation as follows :

[tex]W=hf-E_K\\\\W=6.63\times 10^{-34}\times 2.11\times 10^{-15}-5.83\times 10^{-19}\\\\W=-5.83\times 10^{-19}\ J[/tex]

So, the work function of gold is [tex]5.83\times 10^{-19}\ J[/tex].

Answer:

You discuss your feelings and analyze your emotions.

Explanation:

During free association a therapist or psychoanalyst helps you discuss your feelings and analyze your emotions.

Answer:

In traditional free association, a person in therapy is encouraged to verbalize or write all thoughts that come to mind. Free association is not a linear thought pattern. Rather, a person might produce an incoherent stream of words, such as dog, red, mother, and scoot. They may also jump randomly from one memory or emotion to another.

THE ANSWER IS B

PLEASE MARK BRANIEST

Answer:

P = 3136 Pa

Explanation:

The formula to apply in this case is :

P= rho*g*d  where;

rho = density = 800

g = acceleration due to gravity =9.8 m/s²

d= depth = 10+30 =40 cm = 0.4 m

P= hydrostatic pressure

P= 800 * 9.8 * 0.4

P = 3136 Pa

Answer:

h = 57.6 m

Explanation:

First, we find the linear speed of the ball while in circular motion:

v = rω

where,

v = linear speed of ball = ?

r = radius of circle = length of rope = 1.75 m

ω = angular speed = (3 rev/s)(2π rad/1 rev) = 18.84 rad/s

Therefore,

v = (1.75 m)(18.84 rad/s)

v = 32.98 m/s

Now, we apply the 3rd equation of motion on the ball, when it breaks:

2gh = Vf² - Vi²

where,

g = - 9.8 m/s² (negative sign due to upward motion)

h = height covered = ?

Vf = Final Velocity = 0 m/s (since, the ball finally stops at highest point for a moment)

Vi = Initial Velocity = 32.98 m/s

Therefore,

2(- 9.8 m/s²)h = (0 m/s)² - (32.98 m/s)²

h = ( - 1088.12 m²/s²)/( - 19.6 m/s²)

h = 55.5 m

since, the ball was initially at a height of 2.1 m from ground. So, the total height from ground, will now become:

h = 55.5 m + 2.1 m

h = 57.6 m

Answer: The speed is 4 meters per second or 4 m/s.

Explanation:

First, we have the relationship:

Speed = Distance/Time.

In this case, we know that the fire department arrives to a fire in 210 seconds after leaving the fire station to the burning building which is 840m away, this means that:

Time = 210 seconds

Distance traveled in that time = 840m.

Then the speed is:

Speed = 840m/210s = 4 m/s.

The speed is 4 meters per second.

Answer:

From the concept of energy conservation, Ei=Ef

Explanation:

mgh=1/2mv^2

=> v=

\sqrt{2gh}2gh

=

\sqrt{2 \times 9.8 \times 8.8}2×9.8×8.8

=

\sqrt{172.28}172.28

=13.12m/s.

Answer:

freqiency=velocity/wavelength

ief=20/2000=0.01hz

Well, the tension in the thread will probably quadruple, but the hanging body will continue to just hang there.  

The question gives us no evidence that it is doing any oscillating, and there's no reason for it to start just because it suddenly got heavier.

Answer:

New gravitational force would be: [tex]4.5\,\,\,10^{-5}\,\,\,N[/tex]

Explanation:

Recall the general form of the gravitational force between two objects of masses m1 and m2 separated a distance "d":

[tex]F_g=G\,\frac{m1\,*\, m2}{d^2}[/tex]

which for the 2000 kg trucks becomes:

[tex]F_g=G\,\frac{m1\,*\, m2}{d^2} \\3\,\,\,10^{-5}\,N=G\,\frac{2000\,*\, 2000}{d^2}[/tex]

when we add 1000 kg of bricks to one truck, we get the following unknown force (x) that we need to find:

[tex]F_g=G\,\frac{m1\,*\, m2}{d^2} \\x=G\,\frac{3000\,*\, 2000}{d^2}[/tex]

Now we divide term by term the last equation by the previous one, in order to cancel out common factors to both equation (G, d^2) and get the following equation:

[tex]\frac{x}{3\,\,\,10^{-5}} =\frac{3000}{2000} \\x=\frac{9}{2} \,10^{-5} =4.5\,\,\,10^{-5}\,\,\,N[/tex]

Answer:

the answer is magenta light

Explanation:

When red and blue light are combined, the result is magenta.. When green and blue light are combined, they make cyan. Red and green light make yellow.

Answer:

magenta light

Explanation:

red+blue=purple but the light makes the radius lighter so its magenta

Answer:Distance=6.67 (rounded)

Explanation: Work = Force x Distance.

100 Joules of work= force of 15 N x Distance (?)

The work equation given above can be rearranged to find force or distance if the other variables are known:

Distance=Work / force

Distance=100Joules/15 N

Distance=6.67 (rounded)

Explanation:

ghost do exist and the science behind it is people have experienced paranormal activities

Answer: science has no evidence that ghosts are real

Explanation:

Answer:

The time will be: 25.02 seconds

Explanation:

Given

A bicycle travels at a velocity of 2.33 m/s.

i.e.

and

As we know the formula to find the time

Time = Displacement/Velocity

        = d/v

        = 58.3/2.33

        = 25.02 seconds

Therefore, the time will be: 25.02 seconds