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Ksju [112]
3 years ago
7

An electron drops from the n=6 to the n=4 level of an infinite square well that is 3.10-11 m wide. What is the wavelength of the

photon emitted as a result?
a.
0.148 nm


b.
0.025 nm


c.
0.327 nm


d.
1.205 nm
Physics
1 answer:
almond37 [142]3 years ago
4 0
The answer would be C !
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The three ropes in the figure are tied to a small, very light ring. Two of these ropes are anchored to walls at right angles wit
netineya [11]
<span>Let t be the angle made by T3 with the x-axis.

 T3 * cos(t) = 20 N ---- (1)
 T3 * sin(t) = 60 N ----- (2)

 Square both equations and add:

T3^2 = 20^2 + 60^2 = 400 + 3600 = 4000
T3 = sqrt(4000) = 63.25 N
 
divide (2) by (1):
tan(t) = 60/20 = 3
t = arctan(3) = 71.57 degrees.

</span><span>Since the angle clockwise from the x-axis some books may call it a negative angle and say the angle is -71.57 degrees or round it to -71.6 or even -72 degrees.</span>
8 0
4 years ago
A train accelerates from 30 km/h to 45 km/h in 15.0 second. Find its acceleration and the distance it travels during this time
Bad White [126]

Answer:

a. Acceleration, a = 0.28 m/s²

b. Distance, S = 156 meters

Explanation:

Given the following data;

Initial velocity = 30 km/h

Final velocity = 45 km/h

Time = 15 seconds

a. To find the acceleration;

Conversion:

30 km/h to m/s = 30*1000/3600 = 8.33 m/s

45 km/h to m/s = 45*1000/3600 = 12.5 m/s

Mathematically, acceleration is given by the equation;

Acceleration (a) = \frac{final \; velocity  -  initial \; velocity}{time}

Substituting into the equation;

a = \frac{12.5 - 8.3}{15}

a = \frac{4.2}{15}

Acceleration, a = 0.28 m/s²

b. To find the distance travelled, we would use the second equation of motion given by the formula;

S = ut + \frac {1}{2}at^{2}

Where;

S represents the displacement or height measured in meters.

u represents the initial velocity measured in meters per seconds.

t represents the time measured in seconds.

a represents acceleration measured in meters per seconds square.

Substituting into the equation, we have;

S = 8.3*15 + \frac {1}{2}*(0.28)*15^{2}

S = 124.5 + 0.14*225

S = 124.5 + 31.5

S = 156 meters

8 0
3 years ago
"A proton is placed in a uniform electric field of 2750 N/C. You may want to review (Page) . For related problem-solving tips an
tekilochka [14]

To solve this problem we will start from the definition of Force, as the product between the electric field and the proton charge. Once the force is found, it will be possible to apply Newton's second law, and find the proton acceleration, knowing its mass. Finally, through the linear motion kinematic equation we will find the speed of the proton.

PART A ) For the electrostatic force we have that is equal to

F=qE

Here

q= Charge

E = Electric Force

F=(1.6*10^{-19}C)(2750N/C)

F = 4.4*10^{-16}N

PART B) Rearrange the expression F=ma for the acceleration

a = \frac{F}{m}

Here,

a = Acceleration

F = Force

m = Mass

Replacing,

a = \frac{4.4*10^{-16}N}{1.67*10^{-27}kg}

a = 2.635*10^{11}m/s^2

PART C) Acceleration can be described as the speed change in an instant of time,

a = \frac{v_f-v_i}{t}

There is not v_i then

a = \frac{v_f}{t}

Rearranging to find the velocity,

v_f = at

v_f = (2.635*10^{11})(1.4*10^{-6})

v_f = 3.689*10^{5}m/s

7 0
3 years ago
In which of the following conditions would there be the most resistance?
Natasha2012 [34]

Answer:

A) A warm wire

Explanation:

A warm wire has the most resistance. Heating the metal wire causes atoms to vibrate more, which in turn makes it more difficult for the electrons to flow, increasing resistance. Heating the wire increases resistivity.

8 0
3 years ago
Is metal a matter or molecules
miss Akunina [59]
Matter
Brainliest please
4 0
3 years ago
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