1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
tankabanditka [31]
3 years ago
13

In hydrogen, the transition from level 2 to level 1 has a rest wavelength of 121.6 nm.1).Find the speed for a star in which this

line appears at wavelength 120.4 nm .2).Find the direction for a star in which this line appears at wavelength 120.4 nm .toward us or away from us?3).Find the speed for a star in which this line appears at wavelength 121.4 nm .4).Find the direction for a star in which this line appears at wavelength 121.4 nm .toward us or away from us?5).Find the speed for a star in which this line appears at wavelength 122.2 nm .6).Find the direction for a star in which this line appears at wavelength 122.2 nmtoward us or away from us?7).Find the speed for a star in which this line appears at wavelength 122.9 nm .8.Find the direction for a star in which this line appears at wavelength 122.9 nm .toward us or away from us?
Physics
1 answer:
soldier1979 [14.2K]3 years ago
4 0

Answer:

1). v = - 2960526m/s

2). Toward us

3). v = - 493421m/s

4). Toward us

5). v = 1480263m/s

6).  Away from us

7). v = 3207236m/s

8). Away from us

Explanation:

Spectral lines will be shifted to the blue part of the spectrum if the source of the observed light is moving toward the observer, or to the red part of the spectrum when it is moving away from the observer (that is known as the Doppler effect).

The wavelength at rest is 121.6 nm (\lambda_{0} = 121.6nm)

Redshift: \lambda_{measured} > \lambda_{0}

Blueshift: \lambda_{measured} < \lambda_{0}

Then, for this particular case it is gotten:

Star 1: \lambda_{measured} = 120.4nm

Star 2: \lambda_{measured} = 121.4nm

Star 3: \lambda_{measured} = 122.2nm

Star 4: \lambda_{measured} = 122.9nm

Star 1:

Blueshift: 120.4nm < 121.6nm

Toward us

Star 2:

Blueshift: 121.4nm < 121.6nm

Toward us

Star 3:

Redshift: 122.2nm > 121.6nm

Away from us

Star 4:

Redshift: 122.9nm > 121.6nm

Away from us

Due to that shift the velocity of the star can be determine by means of Doppler velocity.

v = c\frac{\Delta \lambda}{\lambda_{0}}  (1)

Where \Delta \lambda is the wavelength shift, \lambda_{0} is the wavelength at rest, v is the velocity of the source and c is the speed of light.

v = c(\frac{\lambda_{measured}- \lambda_{0}}{\lambda_{0}}) (2)

<em>Case for star 1 \lambda_{measured} = 120.4 nm:</em>

<em></em>

v = (3x10^{8}m/s)(\frac{120.4nm-121.6nm}{121.6nm})

v = - 2960526m/s

Notice that the negative velocity means that is approaching to the observer.

<em>Case for star 2 \lambda_{measured} = 121.4 nm:</em>

v = (3x10^{8}m/s)(\frac{121.4nm-121.6nm}{121.6nm})

v = - 493421m/s

<em>Case for star 3 \lambda_{measured} = 122.2 nm:</em>

v = (3x10^{8}m/s)(\frac{122.2nm-121.6nm}{121.6nm})

v = 1480263m/s

<em>Case for star 4 \lambda_{measured} = 122.9 nm:</em>

v = (3x10^{8}m/s)(\frac{122.9nm-121.6nm}{121.6nm})

v = 3207236m/s

You might be interested in
two strands of DNA produced during replication are copies of each other because each strand in the double helix is
Luden [163]
The correct answer you should be looking for is complementary. :)
6 0
3 years ago
Read 2 more answers
Earth’s gravity keeps the moon in orbit by pulling on it.
MAXImum [283]

Answer:

A. pulls back on the Earth, which is the main cause of the rise and fall of the ocean tides on Earth.

5 0
3 years ago
Read 2 more answers
The normal force which the path exerts on a particle is always perpendicular to the _________________ tangent to the path. trans
Marianna [84]
Tangent to the pathh.
7 0
3 years ago
You have seen magnets sticking to the refrigerator door, or maybe in your science class room. They attract metal items, for exam
DENIUS [597]

Answer:

B) shrinks

Explanation:

The magnetic force is a force exerted between two magnets, or two magnetic materials, or also on an electric charge moving in a magnetic field.

If we talk about magnetic material, the magnetic field they generates can be represented using a dipole: essentially, they have a north pole (where the lines of the field go out) and a south pole (where the lines of the field go in).

Also, the lines spread apart as we move away from the magnet itself. This means that the strength of the field (and so, the intensity of the force) decreases as we move away from the magnet.

Using this description, we can now understand that when we move the paper clip further from the magnet, the force exerted on the clip decreases, as the magnetic field becomes weaker. So, the correct answer is B.

3 0
3 years ago
A small sphere with mass m is attached to a massless rod of length L that is pivoted at the top, forming a simple pendulum. The
USPshnik [31]

Answer:

a) see attached, a = g sin θ

b)

c)   v = √(2gL (1-cos θ))

Explanation:

In the attached we can see the forces on the sphere, which are the attention of the bar that is perpendicular to the movement and the weight of the sphere that is vertical at all times. To solve this problem, a reference system is created with one axis parallel to the bar and the other perpendicular to the rod, the weight of decomposing in this reference system and the linear acceleration is given by

          Wₓ = m a

          W sin θ = m a

          a = g sin θ

b) The diagram is the same, the only thing that changes is the angle that is less

                θ' = 9/2  θ

             

c) At this point the weight and the force of the bar are in the same line of action, so that at linear acceleration it is zero, even when the pendulum has velocity v, so it follows its path.

The easiest way to find linear speed is to use conservation of energy

Highest point

            Em₀ = mg h = mg L (1-cos tea)

Lowest point

          Emf = K = ½ m v²

          Em₀ = Emf

          g L (1-cos θ) = v² / 2

              v = √(2gL (1-cos θ))

4 0
3 years ago
Other questions:
  • A student uses an electronic force sensor to study how much force the student’s finger can apply to a specific location. The stu
    12·2 answers
  • Parallel and series circuits<br><br>I am quite confused as to how I can tackle this question
    6·1 answer
  • Helen Keller was stricken with scarlet fever as an infant and ended up blind and with no hearing. Her ability to speak didn't oc
    11·2 answers
  • If a bird applies a 5 N upward force on a branch to lift the branch of ground to a
    11·1 answer
  • An electric flux of 147 N*m^2/C passes through a flat horizontal surface that has an area of 0.824 m^2. The flux is due to a uni
    11·1 answer
  • Two resistors of resistances R1 and R2, with R2&gt;R1, are connected to a voltage source with voltage V0. When the resistors are
    11·1 answer
  • The hydraulic lift in a car repair shop has an output diameter of 30 cm and is to lift cars up to 2000 kg. determine the fluid g
    15·2 answers
  • Action and reaction forces will cancel because they are pushing on the same object toward each other. True or False
    8·2 answers
  • A child and sled with a combined mass of 54.8
    11·1 answer
  • The image on the right was produced by a computer. It shows a complex molecule consisting of many atoms. What would be an advant
    11·2 answers
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!