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ladessa [460]
4 years ago
10

Through what potential difference must an electron be accelerated from rest to have a de Broglie wavelength of 500 nmnm

Physics
1 answer:
Marina86 [1]4 years ago
7 0

Answer:

V = 6.04 10⁻⁶ V

Explanation:

The energy in a system is conserved so the potential energy of the system must be transformed into the kinetic energy of the electron.

              E_{p} = K

              eV = ½ m v²

              V = ½ m v²/e

Let's use the de Broglie relation

             λ= h / p

the moment is

            p = mv

let's replace

            λ = h / mv

            v = \frac{h}{m \lambda }

hence the potential energy

             V = ½ \frac{m}{e} (\frac{h}{m \lambda })²

            V = \frac{h^{2} }{2e  m \lambda^{2} }

let's reduce λ to sistem SI

             λ = 500 nm = 500 10⁻⁹ m = 5 10⁻⁷ m

let's calculate

             V = (6.63 10⁻³⁴)² / (9.1 10⁻³¹  1.6 10⁻¹⁹ (5 10⁻⁷)² )

         

             V = 6.04 10⁻⁶ V

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A sled is at rest at the top of a slope 2 m high. The sled has a mass of 45 kg. What is the sled's potential energy?
kap26 [50]

Answer:

PE = 882 J

Explanation:

Through the International System we know that the gravity of the earth is 9.8 m/s², so...

Data:

  • m = 45 kg
  • g = 9.8 m/s²
  • h = 2 m
  • PE = ?

Formula:

  • \boxed{\bold{PE=m*g*h}}

Replace and solve:

  • \boxed{\bold{PE=45\ kg*\ 9.8\frac{m}{s^{2}}*2\ m}}
  • \boxed{\boxed{\bold{PE=882\ J}}}

The potential energy of the sled is <u>882 Joules</u>.

Greetings.

8 0
3 years ago
What is the scientific law?
storchak [24]

Answer:

Explanation:

A scientific law is the statement which is based on the repeated experimental trials and observations. The scientific law is abide by the scientific community and major research are based on this. The content or information of scientific law cannot be changed.

7 0
3 years ago
Which object has a varying speed? a bird flying at 10 m/s for 10 seconds a car slowing from 60 m/s to 0 m/s a car traveling the
dolphi86 [110]

Answer:

The car slowing from 60 m/s to 0 m/s

Explanation:

The bird flying at 10m/s for 10 seconds will have the same speed for those 10 seconds. So we can say it doesn't have a varying speed (During those 10 seconds, we don't have any information about what happens later).

The fish moving at 2m/s for 5 minutes will have the same speed for those 5 minutes. So we can say it doesn't have a varying speed (During those 5 minutes, we don't have any information about what happens later).

The car traveling the speed limit, we know that his speed is the speed limit. It doesn't change.

The car slowing from 60 m/s to 0 m/s needs to change his speed in order to go from 60 m/s to 0 m/s. The speed will decrease progressively until the car completely stops.

8 0
3 years ago
You are traveling 70 mph (31.3 m/s) and slam on the brakes to avoid hitting another car. How far do you travel if it takes you 8
Arlecino [84]

You traveled a distance of 620.075 meters if it takes you 8.5 seconds to stop.

<u>Given the following data:</u>

  • Initial velocity, U = 31.3 m/s  
  • Time, t = 8.5 seconds.

We know that acceleration due to gravity (a) for an object is equal to 9.8 meter per seconds square.

To find the distance traveled, we would use the second equation of motion:

Mathematically, the second equation of motion is given by the formula;

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

Where:

  • S is the distance travelled.
  • u is the initial velocity.
  • a is the acceleration.
  • t is the time measured in seconds.

Substituting the parameters into the formula, we have;

S = 31.3(8.5) + \frac{x}{y} (9.8)(8.5^2)\\\\S = 266.05 + 4.9(72.25)\\\\S = 266.05 + 354.025

<em>Distance, S</em><em> = </em><em>620.075 meters.</em>

Therefore, you traveled a distance of 620.075 meters if it takes you 8.5 seconds to stop.

Read more: brainly.com/question/8898885

6 0
2 years ago
PLEASE HELP ASAP
Triss [41]

Answer:

The force will be cut in half also so the new force will be 18 N (d).

5 0
3 years ago
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