In a certain semiconducting material the charge carriers each have a charge of 1.6 x 10-19C. How many are entering the semiconductor per second when the current is 2.0 nA?
Answers
Answer:
1124923453 electrons
Explanation:
The formula for charge in coulomb ,C =Current in amperes, A * Time in seconds, s
Given in question ;
Charge = 1.6 * 10⁻¹⁹ C
Current = 2.0 nA = 2*e⁻⁹ A
Calculate time in seconds as
1.6 * 10⁻¹⁹ = 2*e⁻⁹ * t
1.6 * 10⁻¹⁹ /2*e⁻⁹ = t
6.48e⁻¹⁶ s = t
So using t=6.48e⁻¹⁶ s and current =2*e⁻⁹ A , the charge will be;
C = 2*e⁻⁹ * 6.48e⁻¹⁶ =1.799e⁻¹⁰ C
But 1 coulomb = 6.25 x 10¹⁸ electrons
so 1.799e⁻¹⁰ C = ?,,,,{ 6.25 x 10¹⁸} *{1.799e⁻¹⁰} = 1124923453.06 electrons
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Which of the following variables do you need to know in order to calculate the partial pressure of a gas? (We are going to ignore water vapor here.) Check all that apply. a. the volume of the container that the gas is in b. the percentage of the gas c. the percentage of the other gases that comprise the atmosphere d. the total pressure in the atmosphere
Streams of electrically charged particles flowing at high speeds from the sun make up the
Answers
Answer:
1.87 s
Explanation:
Initial speed of throw = 9.20 m/s
Net vertical displacement = 0
The bowling pin would be in free fall i.e. a = 9.8 m/s²
Use the second equation of motion:
s = ut + 0.5at²
0 = (9.20)t-0.5(9.8)(t²)
9.20 = 4.9 t
⇒t = 1.87 s
Thus, the total time of flight, the time elapses before the bowling pin falls in juggler's hand is 1.87 s.
A juggler throws a bowling pin straight up with an initial speed, the time that elapses before the pin reaches the juggler's hands is 1.88 s.
Given:
Initial speed, u = 9.2 m/s
The time can be calculated from the second equation of motion. The second equation of motion provides a relation between height, initial speed, acceleration, and time respectively.
From the second equation of motion:
h = ut + at²
When the ball reaches the hands, the distance becomes zero. Therefore, the time is:
0 = 9.2t -0.5 × 9.8t²
9.8t = 18.4
t = 18.4÷ 9.8
t = 1.88 s
Hence, the time that elapses before the pin reaches the juggler's hands is 1.88 s.
To learn more about time, here:
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dissolved toxic materials wash from mines into nearby lakes and streams.
a buildup of residual acidity in soils destroys large areas of vegetation.
the acidity of metals in mines exceeds level 9 on the pH scale.
Answers
Answer:
Acid mine drainage is dissolved toxic materials wash from mines into nearby lakes and streams.
Explanation:
Acid mine drainage is the flow of acidic water with pH typically between 2 and 4, and high concentrations of other dissolved toxic materials from mines into nearby lakes and streams. It mainly occurs during metal sulfide mining, when the metal sulfide ore such as pyrite (FeS2) is exposed to water and oxygen from air to produce soluble iron and sulfuric acid.
Microorganisms, especially acidophile bacteria like Acidithiobacillus ferrooxidans grow by pyrite oxidation, i.e., oxidizing the Fe²⁺ in pyrite to Fe³⁺, which again react with pyrite and water to produce sulfuric acid. Then the acidic water flows into nearby water sources and reduces the pH value of water in those sources. As a result, heavy metals such as copper, lead, mercury, etc in other mineral ores also get dissolved into the water. The action of acidophile bacteria also increases the rate and degree of acid-mine drainage process.
The acid mine drainage causes water pollution and adversely affect the aquatic plants and animals. It also results in the contamination of drinking water, corrosion of infrastructures such as bridges, etc.
1.0 x 10^2 A
1.0 x 10^-10 A
4.0 x 10^0 A
Answers
I = 2.0 x 10^-4 C / 5.0 x 10^-5 s
I = 4 A
Q= I×t
Where Q is charge in Coulombs C,
I is current in Amperes A,
t is in seconds s.
The rate of current flow is defined as the charge passing through a point in the circuit per second.
Rearranging formula gives I=
⇒I = = 4 Amperes
∴ current flow = 4.0×10^0 A
Answers
V=IR
In the question, the following values are given:
V = 4.5
I = 0.75
Substitute the values into the equation to find R, the resistance:
V = IR
4.5 = 0.75R
R = 4.5 / 0.75
R = 6 ohms
Answers
Answer:
a)0.9675 h
b)5.168 mph
c)0.885 h
d)5.65 mph
Explanation:
The distance travelled by a moving object can be calculated as the velocity multiplied by the time, for this problem we can divide the problem in two stages, one where the are walking and another where they run,
Considering the total time for Anya is :
She first walks for half the distance (2.5 miles) so:
Solving for :
Then she runs the other half of the distance:
Adding this two durations we have the total time it takes for Anya to cover the distance:
The average velocity can be calculated as the total distance divided by the total time:
Considering the total time for Ilya is :
She first walks for half the time so:
Where is the velocity when walking (same for both people). On the second half she runs:
This two distances must sum the total distance 5 miles, so:
replacing the expressions above:
so it takes Ilya 0.885 hours to to cover the distance
The average velocity can be calculated as the total distance divided by the total time:
c. the force decreases
b. the pressure increases
d. the volume decreases
Answers
I think the answer is A.