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2 years ago

Pls help will give brainliest and 5star pls help really need it

Mathematics

1 answer:

Temka [501]2 years ago

8 0

It would be B or 1,625 because percentages are going to always involve multiplication. if I'm wanting to find a percentage you do .25 times 6,500 which leaves you with 1,625.

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A certain semiconductor device requires a tunneling probability of T = 10-5 for an electron tunneling through a rectangular barr

Goryan [66]

Answer:

Generally the barrier width is $a = 1.9322 *10^{-9} \ m$

Step-by-step explanation:

From the question we are told that

The tunneling probability required is $T = 1 * 10^{-5}$

The barrier height is $V_o = 0.4 eV$

The electron energy is $E = 0.08eV$

Generally the wave number is mathematically represented as

$k = \sqrt{ \frac{2 * m [V_o - E]}{\= h^2} }$

Here m is the mass of the electron with the value $m = 9.11 *10^{-31} \ kg$

h is is know as h-bar and the value is $\= h = 1.054*10^{-34} \ J \cdot s$

$k = \sqrt{ \frac{2 * 9.11 *10^{-31 } [0.4 - 0.04] * 1.6*10^{-19}}{[1.054*10^{-34}^2]} }$

=> $k = 3.073582 *10^{9} \ m^{-1}$

Generally the tunneling probability is mathematically represented as

$T = 16 * \frac{E}{V_o } * [1 - \frac{E}{V_o} ] * e^{-2 * k * a}$

$1.0 *10^{-5} = 16 * \frac{0.04}{0.4 } * [1 - \frac{0.04}{0.4} ] * e^{-2 * 3.0736 *10^{9} * a}$

=> $6.944*10^{-6}= e^{-2 * 3.0736 *10^{9} * a}$

Taking natural log of both sides

$ln[6.944*10^{-6}] = -2 * 3.0736 *10^{9} * a}$

=> $-11.8776 = -2 * 3.0736 *10^{9} * a}$

=> $a = 1.9322 *10^{-9} \ m$

4 0

2 years ago

Please help I’ll make Brainly answer!!

ivolga24 [154]

Answer:

what they said ^^

Step-by-step explanation:

I did this so no one puts the incorrect answer

8 0

2 years ago

Point e is located at -12 on the numbers line. Point f is located at 9 on the numbers line.

nikitadnepr [17]

The distance would be 21. to find the difference, add the absolute values so 12+9, which equals 21

6 0

2 years ago

TUILS<br> If f (x) = 8x and g(x) = 2x +1, find (fog)(x).

S_A_V [24]

Answer:

Step-by-step explanation:

(fog)(x) = f(x)*g(x)

= 8x * (2x + 1)

= 8x * 2x + 8x * 1

= 16x² + 8x

5 0

2 years ago

Convert 5.764764764 to a rational expression

NISA [10]

Answer: 5 and 764 over 999

5764 over 9999

5 and 764 over 99

5 and 999 over 764

Step-by-step explanation:

8 0

2 years ago