If the radius of an electron's orbit around a nucleus doubles but the wavelength remains unchanged, what happens to the number of electron wavelengths that can fit in the orbit?

Answer:

Copper is a better heat conductor than glass. In general, we think of metals as good conductors. In fact, metals vary widely in their conductivity but, overall, they are better conductors of heat than most liquids and gasses. Other solids also vary in their capability to conduct heat.

Explanation:

The best thermal insulator is glass. The correct option is D.

The prevention of heat transfer between surfaces that are in thermal contact or within a radiative influence zone is known as thermal insulation.

In addition to using the right item forms and materials, specially engineered technologies or processes can also be used to provide thermal insulation.

The term "thermal insulation" refers to the various ways we try to prevent heat from transferring from one object to another.

These two items could be the inside and outside of exterior walls in residential structures or the hot and cold faces of processing equipment in industrial settings.

Glass has a very small amount of unpaired electrons that are not in use, making it a good electrical insulator. Extremely strong electron interactions hold the atoms of glass together.

Thus, the correct option is D.

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Answer:

The correct answer is "0.32 mL".

Explanation:

The given values are:

Density of gold bar,

d = 19.3 g/mL

Mass of gold bar,

m = 6.3 grams

Now,

The volume will be:

⇒  [tex]Density = \frac{Mass}{Volume}[/tex]

or,

⇒  [tex]Volume=\frac{Mass}{Density}[/tex]

On substituting the values, we get

⇒               [tex]=\frac{6.3 \ g}{19.3 \ g/mL}[/tex]

⇒               [tex]=0.32 \ mL[/tex]

Answer:

151.2 m/s

Explanation:

m1 = 0.020 kg

m2 = 2.5 kg

vf = 1.2 m/s

m1v1 +m2v2 = (m1 +m2)vf

0.020v1 + 0 = (0.020 +2.5)(1.2)

---> 151.2 m/s

Answer:

The correct option is (b).

Explanation:

The ideal gas law is given by :

[tex]PV=nRT[/tex]

Where

P, V and T are pressure, volume and temperature of the gas

R is gas constant

[tex]V=\dfrac{nRT}{P}[/tex]

If n,R and P are constant,

[tex]V\propto T[/tex]

i.e.

At constant pressure, the volume of a gas is directly proportional to its temperature. Hence, the correct option is (b).

Answer: e) turbidity​

Explanation:

Evaporation is  defined as the process by which a liquid without being heated is converted into vapor.

The factors that affect the rate of evaporation of a liquid are:

a) humidity-When the humidity of an environment is high, it will take more time for water to escape to the atmosphere and less time, if the reverse is the case because Humidity is the amount of water vapor in the atmosphere. For example, on a rainy day, clothes tend to dry slower than a sunny day.

b) nature of liquid- different liquids have different rate of evaporation, For example, alcohol will evaporate faster than water

c) pressure - The higher the pressure  on the surface of a body of water, the slower the  evaporation rate and vice versa.

d) temperature- The temperature of a surrounding affect how fast a liquid ,(water) can evaporate. When the temperature of the liquid  is increased, it raises the kinetic energy of the individual molecules that make up the liquid thereby reducing the inter molecular forces of attraction holding the liquid together and causing fast  escape into the atmosphere as a vapor or gas

e) turbidity​  shows the extent water loses its transparency due to the presence of suspended particles lie clay, silt, organic matter etc and so is not a factor that affect rate of evapouration

Answer:

(b) 490 N downwards

Explanation:

(b) Formula : w= mg

m is the mass of the object

g is a gravitational constant (9.8)

w= mg

= 50×9.8

= 490 N downwards

Answer: one of the things that determinates something is a planet and not a star is that planets are constanlty moving around the sun while stars are "still"

Explanation:

Answer:

1. It must orbit a star (in our cosmic neighborhood, the Sun).

2. It must be big enough that its gravity cleared away any other objects of a similar size near its orbit around the Sun.

Explanation:

I hope this helps!

Answer:

4

Explanation:

Velocity ratio is the ratio of distance moved by effort to the ratio of distance moved by load

Velocity ratio = Distance moved by effort / Distance moved by load

Distance moved by effort = 20m

Distance moved by load = 5m

20m / 5m = 4

Answer: [tex]37.28^{\circ}[/tex]

Explanation:

Given

Angle made with the x-axis is [tex]\alpha=70^{\circ}[/tex]

Angle made with the y-axis is [tex]\beta=60^{\circ}[/tex]

Suppose angle made with z-axis is [tex]\gamma[/tex]

[tex]\therefore \cos^2\alpha+\cos^2\beta+\cos^2\gamma =1[/tex]

Inserting values

[tex]\Rightarrow \cos^2(70^{\circ})+\cos^2(60^{\circ})+\cos^2\gamma=1\\\Rightarrow 0.1169+0.25+\cos^2\gamma=1\\\Rightarrow \cos^2\gamma=0.6331\\\Rightarrow \cos \gamma=0.7956\\\Rightarrow \gamma=37.28^{\circ}[/tex]

Answer:

4

Explanation:

2*2

www.omnicalculator.com/physics/wavelength

Answer:

Epicenter

Explanation:

The epicenter is the location of tectonic plate movement where an earthquake begins.

Answer:

Current, I = 0.000109 Amps

Explanation:

Given the following data;

Voltage = 6V

Resistance = 55,000 Ohms

To find the current flowing through the circuit;

Ohm's law states that at constant temperature, the current flowing in an electrical circuit is directly proportional to the voltage applied across the two points and inversely proportional to the resistance in the electrical circuit.

Mathematically, Ohm's law is given by the formula;

[tex] V = IR[/tex]

Where;

V represents voltage measured in voltage.

I represents current measured in amperes.

R represents resistance measured in ohms.

Making current the subject of formula, we have;

[tex] I = \frac {V}{R} [/tex]

Substituting into the formula, we have;

[tex] I = \frac {6}{55000} [/tex]

Current, I = 0.000109 Amps

25

Explanation:

P1V1=P2V2 hence 50×30=60v

V=1500÷60

V=25

Answer:

I. 56

II. c is the speed of light in vacuum.

III. 385.180×10¯²⁷ Kg.

Explanation:

I. Determination of the value of p.

²³⁸₉₂U + ¹₀n —> ¹³⁹ₚBa + ⁹⁷₃₆Kr + 3 ¹₀n

92 + 0 = p + 36 + 3(0)

92 = p + 36

Collect like terms

92 – 36 = p

56 = p

Therefore, the value of p is 56

II. Determination of the meaning of c

ΔE = Δmc²

In the Einstein's equation above,

E => is the energy

m => is the mass

c => is the speed of light in vacuum.

III. Determination of the total mass of the element formed after the reaction.

From the reaction above, the elements formed after the reaction are:

Barium–139 and Krypton–97. Thus, we can obtain the total mass of the elements formed as follow:

Mass of Ba–139 = 232.560×10¯²⁷ Kg

Mass of Kr–97 = 152.620×10¯²⁷ Kg

Total mass =?

Total mass = mass of Ba–139 + mass of Kr–97

Total mass = 232.560×10¯²⁷ + 152.620×10¯²⁷

Total mass = 385.180×10¯²⁷ Kg

Answer:

the answer is 6.25

Explanation:

Answer:

16/100 = 4/25

Explanation:

The given are 10 ohms 20 ohms and 100 ohms.

The formula for getting the parallel circuit is 1/r1 + 1/r2 + 1/r3 (the denominators are the given)

Then we calculate, Rp=1/10+1/20+1/100=10/100+5/100+1/100=16/100

Answer:

I need to talk to somone about my confusing love life

Explanation:

Answer:

d = 493.72 m

Explanation:

Given that,

Initial velocity of the train, u = 80 km/h = 22.22 m/s

Acceleration of the train, a = -0.5 m/s² (negative as it slows down)

Finally brakes are applied, v = 0

We need to find the distance the train travels. Let the distance be d. Using third equation of kinematics to find it.

[tex]v^2-u^2=2ad\\\\d=\dfrac{v^2-u^2}{2a}\\\\d=\dfrac{0^2-(22.22)^2}{2\times (-0.5)}\\\\d=493.72\ m[/tex]

So, the required distance is equal to 493.72 m.

Answer:

When one light in the circuit burns out, the rest of the lights will go out.

Explanation:

When one light goes out, and the current is broken. Causing all remaining lights to go out as well.

Answer:

t = 0.553

Explanation:

The mass has nothing to do with an object falling.

Givens

d = 1.5 m

a = 9.8

vi = 0

t = ?

Formula

d = vi * t + 1/2 a t^2

Solution

1.5 = 0 + 1/2 9.81 * t^2

1.5 = 4.905 t^2

1.5/4.905 = t^2

0.3058 = t^2

sqrt(t^2) = sqrt(0.3058)

t = 0.553

About 1/2 a second which is really surprising wouldn't you think?

Answer:

b

Explanation:

the solar system is smaller then nebula nebula is smaller then a galaxie and a galaxie is smaller then a universe

Answer:

71344 J

Explanation:

From the law of conservation of energy,

Mechanical Energy = Kinetic Energy + Potential Energy

M.E = (mv²/2)+ mgh.................... Equation 1

Where M.E = Mechanical Energy, m = mass, v = Velocity, h = height, g = acceleration due to gravity.

Given: m = 52 kg, v = 28 m/s, h = 100 m (half way down the ski jump)

Constant: g = 9.8 m/s²

Substitute these values into equation 1

M.E = (52×28²/2) + (52×100×9.8)

M.E = 20384+50960

M.E = 71344 J

Answer:

phares

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It's a distinct stage in a process of change or dev't

Answer:

C. Changes mechanical energy to electrical

Answer:

A,C and D

Explanation:

Answer:

lightning KILLUAAAA

Answer:

A sonar device sends pulses of sound waves down through the water. When these pulses hit objects like fish, vegetation or the bottom, they are reflected back to the surface. The sonar device measures how long it takes for the sound wave to travel down, hit an object and then bounce back up.

Answer:

Differences

similarities

wave length and wave speed will remain the same

Explanation:

A wave  generated by Oscillation and paused at two different times will maintain certain characteristics at all times while some characteristics will differ along the wave as it it paused

The differences in the characteristics of the wave at different time ( i.e. at paused and unpaused times )

similarities :

wave length and wave speed will remain the same

Answer:

go for a walk/run

pace while texting/calling someone

park further away

take the stairs instead of the elevator

get up and get something frequently, or move between rooms frequently

Answer:

The incorrect part of the chart is;

Line 1

Chemical [tex]{}[/tex] Reaction   [tex]{}[/tex]                                   Nuclear Reaction

Line 1 Happens in the nucleus of atoms   [tex]{}[/tex] Happens between atoms

Explanation:

The given chart can be presented as follows;

  Chemical Reaction [tex]{}[/tex]                               Nuclear Reaction

1. Happens in the nucleus of atoms    [tex]{}[/tex]   Happens Between atoms

2. Forms new compounds [tex]{}[/tex]                     Forms new atoms

3. Involves small amounts of energy [tex]{}[/tex]    Involves large amounts of energy

From the above chart, line 1 is incorrect because a chemical reaction happens between the valence electrons of the reacting atoms while a nuclear reaction is the reaction that takes place between the nucleus of two or more atoms or the nucleus of an atom and a subatomic particle to produce one or more than new nuclide of a new atom with a change in the mass of the nucleus being represented by the large amount of energy in the reaction. Therefore, a nuclear reaction takes place in the nucleus of an atom, forms new atoms and involves large amounts of energy

The correct arrangement is presented as follows;

  Chemical Reaction [tex]{}[/tex]                              Nuclear Reaction

1. Happens Between atoms    [tex]{}[/tex]                Happens in the nucleus of atoms

Explanation:

The potential energy is stronger at the start of the bounce and when it is near the end bounce the balls accelerated rate will be lower because the force has decreased . Also I love your profile picture miraculous rocks !