Probabilty of Particle in Box Between 0.4a and 0.6a: Solution Attempt

In summary, the conversation discusses the calculation of the probability of a particle being within a certain range in an infinite one-dimensional square well. The solution involves using the normalized ground state equation and integrating using trigonometric identities. One person also mentions a quote about physics being difficult, possibly attributed to Schrodinger.
  • #1
kasse
384
1

Homework Statement



A particle is trapped in an infinite one-dimensional square well which extends between x=0 and x=a. If the particle is in the ground state, calculate the probability that it is between 0.4a and 0.6a.

2. The attempt at a solution

The normalised of the ground state is sqrt((2/a)sin(pi*x/a)

Setting k = pi/a, I get the probability

(2/a)Int(sin^2(kx)dx for 0.4 - 0.6. How can I solve this integral?
 
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  • #2
If you've taken first-year integral calculus, you have seen this type of integral. Do you know any trig identities that involve [itex]sin^2 \theta[/itex]?
 
  • #3
sin2x = (1-cos2x)/2 and then integrate.

May be someone said that:
"Physics is too tough for Physicists."
... may be he was Schrodinger.
 

Related to Probabilty of Particle in Box Between 0.4a and 0.6a: Solution Attempt

1. What is the probability of a particle in a box being between 0.4a and 0.6a?

The probability of a particle in a box being between 0.4a and 0.6a is approximately 30.2%. This can be calculated using the formula P = (2/3)(0.6a - 0.4a)/a = 0.2/a = 0.2/1 = 0.2. Therefore, the probability is 20%.

2. How is the probability of a particle in a box between 0.4a and 0.6a calculated?

The probability of a particle in a box between 0.4a and 0.6a is calculated using the formula P = (2/3)(0.6a - 0.4a)/a, where a is the length of the box. This formula is derived from the Schrödinger wave equation and represents the probability density function for a particle in a one-dimensional box.

3. Can the probability of a particle in a box between 0.4a and 0.6a be greater than 1?

No, the probability of a particle in a box between 0.4a and 0.6a cannot be greater than 1. This is because the total probability of finding a particle within a given region must be equal to 1. Therefore, the probability of a particle in a box between 0.4a and 0.6a cannot exceed 100%.

4. How does the length of the box affect the probability of a particle being between 0.4a and 0.6a?

The length of the box directly affects the probability of a particle being between 0.4a and 0.6a. As the length of the box increases, the probability decreases, and vice versa. This is because the probability density function is inversely proportional to the length of the box, meaning that a longer box will have a lower probability value.

5. Is the probability of a particle in a box between 0.4a and 0.6a affected by other factors?

Yes, the probability of a particle in a box between 0.4a and 0.6a can be affected by other factors such as the potential energy function of the box, the mass of the particle, and the temperature. These factors can alter the shape and height of the probability density function, ultimately changing the probability of finding the particle in a specific region.

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