More current makes a ________ electromagnet. longer stronger weaker

Be sure to answer all parts. Consider the following energy levels of a hypothetical atom: E4 −2.01 × 10−19 J E3 −5.71 × 10−19 J

pashok25 [27]

(a) 159 nm

First of all, let's calculate the energy difference between the level E1 and E4:

$\Delta E=E_4 -E_1 = -2.01\cdot 10^{-19}J-(-1.45\cdot 10^{-18} J)=1.25\cdot 10^{-18} J$

Now we know that this energy difference is related to the wavelength of the absorbed photon by

$\Delta E=\frac{hc}{\lambda}$

where

$h=6.63\cdot 10^{-34} Js$ is the Planck constant

$c=3\cdot 10^8 m/s$ is the speed of light

$\lambda$ is the wavelength of the photon

Solving for $\lambda$ , we find

$\lambda=\frac{hc}{\Delta E}=\frac{(6.63\cdot 10^{-34} Js)(3\cdot 10^8 m/s)}{1.25\cdot 10^{-18} J}=1.59\cdot 10^{-7} m = 159 nm$

b) 293 nm

As done in part a), let's calculate the energy difference between the level E2 and E3:

$\Delta E=E_3 -E_2 = -5.71\cdot 10^{-19}J-(-1.25\cdot 10^{-18} J)=6.79\cdot 10^{-19} J$

this energy difference is related to the wavelength of the absorbed photon by

$\Delta E=\frac{hc}{\lambda}$

Solving for $\lambda$ again, we find

$\lambda=\frac{hc}{\Delta E}=\frac{(6.63\cdot 10^{-34} Js)(3\cdot 10^8 m/s)}{6.79\cdot 10^{-18} J}=2.93\cdot 10^{-7} m = 293 nm$

c) 226 nm

As done in part a) and b), let's calculate the energy difference between the level E1 and E3:

$\Delta E=E_3 -E_1 = -5.71\cdot 10^{-19}J-(-1.45\cdot 10^{-18} J)=8.79\cdot 10^{-19} J$

this energy difference is related to the wavelength of the emitted photon by

$\Delta E=\frac{hc}{\lambda}$

Solving for $\lambda$ again, we find

$\lambda=\frac{hc}{\Delta E}=\frac{(6.63\cdot 10^{-34} Js)(3\cdot 10^8 m/s)}{8.79\cdot 10^{-18} J}=2.26\cdot 10^{-7} m = 226 nm$

4 0

3 years ago

What work is done when a person pushes a refrigerator across the floor 12m using 480N of force ?

KiRa [710]

Answer:

W = 5760 J

Explanation:

Force (F) = 480 N
Distance (d) = 12 m
Work (W) = ?

Use the formula:

W = F * d

Replace with the data, and solve:

W = 480 N * 12 m
W = 5760 J

The work done was 5760 Joules.

Greetings.

6 0

3 years ago

What is the motion of the particles in this kind of wave?

densk [106]

The particles will move up and down over small areas.

Option B.

Explanation:

The type of the wave that has been discussed in the question is the transverse kind of wave. The transverse kind of wave are the waves where the particle motion is the perpendicular to the motion of the wave.

In the transverse kind of wave the which is a moving kind of a wave where the oscillations are perpendicular to the direction of the movement of the wave.

8 0

3 years ago

If a cylindrical space station 275 m in diameter is to spin about its central axis, at how many revolutions per minute (rpm) mus

sergij07 [2.7K]

The centripetal acceleration is responsible for the artificial gravity because the acceleration of an object moving in constant circular motion causing from net external force is called centripetal acceleration. It defines to the center or seeking the center.

Given the following:

Cylindrical space station diameter = 275 meters; 137.5 meters for the radius

Standard gravity = 9.80665 m/s²

Using the formula:

w² x r =g

w² = g / r

w² = 9.80665 m/s² / 137.5 m

w² = 0.0713 s²

Then take the roots

w = 0.267 this is radians per second / 2 x (3.1416 which is the pi)

w = 0.0424 rps convert to rpm

w = 0.0424 r/s (1minute / 60 seconds)

w = 7.08 x 10⁻⁴ revolutions per minute

4 0

4 years ago

What does it mean to say that scientific models are open to change?

Natalija [7]

Answer:

B

Explanation:

4 0

3 years ago

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