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
Sonja [21]
3 years ago
8

DetermiOne of the lines in the Balmer series of the hydrogen atom emission spectrum is at 397 nm. It results from a transition f

rom an upper energy level to n=2. What is the principal quantum number of the upper level?ne the initial energy level, ninitial from which the electron in the hydrogen relaxed from to the final energy level, nfinal , 4, if the emitted light has a frequency equal to 74 x 1012 (1/sec). Is this wavelength in the visible region of the electromagnetic spectrum?
Physics
1 answer:
larisa86 [58]3 years ago
6 0

Answer:

a)n =7 , b) n = 5

Explanation:

The energy levels of the hydrogen atom is described by the Bohr model

       E_{n} = - 13.606   1/n²

This equation energy is given in elector volts and n is an integer

A transition occurs when the electro sees from a superior to a lower state

       E₀ - E_{n} = -13.606 (1/n_{f}² - 1/n₀²)

Let's apply this expression

         n₀ = 2

Let's look for the energy of the different levels and subtract it

n₀          E_{n} (eV)

1            -13,606

2            -3.4015

3           - 1.5118

4           -0.850375

5           -0.54424

6           -0.3779

7           -0.2777

The wavelength of the transition is 397 nm = 397 10⁻⁹ m

The speed of light is related to wavelength and frequency

       c = λ f

The Planck equation gives the energy of a transition

      E = h f

      E = h c /λ

Let's calculate

     E = 6.63 10⁻³⁴ 3 10⁸/397 10⁻⁹

     E = 5.01 10⁻¹⁹ J

Let's reduce to eV

     E = 5.01 10⁻¹⁹ J (1 eV / 1.6 10⁻¹⁹ J)

     E = 3.1313 eV

Let's examine the possible transitions from the initial level ni = 2

     ΔE = E_{2} - E_{n} = -3.1313

     En = 3.13 -3.4015

     E_{n} = 0.2702 eV

When examining the table we see that the level that this energy has is the level of n = 7

Part B      the transition is in the infrared

The frequency is 74 10¹² Hz

We use the Planck equation

       E = h f

       E = 6.63 10⁻³⁴ 74 10¹²

       E = 4.9062 10⁻²⁰ J

       E = 4.9062 10⁻²⁰ / 1.6 10⁻¹⁹

       E = 0.3066 eV

We look for the level with the energy difference

     ΔE = E₄- E_{n} = 0.3066

     E_{n} = 0.3066 - 0.85037

     E_{n} = -0.54376 eV

When examining the table this energy has the level n = 5, therefore from this level the transition occurs

You might be interested in
BRAINLIESTTTT!!!!! THIS IS DUE IN 5 MINUTES!<br>​
Gnesinka [82]

Equation: -10 40/4^2

Explanation: I multiplied the -10, but idk if that' what you do cause I've never done this. So if you do do that it's -1000, but that is probably wrong. Sorry, I tried.

8 0
3 years ago
What is the great egg drop experiment about?
kondaur [170]
Whichever person or group can build something to protect the egg from cracking when it is dropped from a high spot without it breaking or cracking wins
6 0
3 years ago
Read 2 more answers
PLEASE HELP ME WITH THIS ONE QUESTION
adoni [48]

Answer:

B) R1 = 6 V and R2 = 6V

Explanation:

In series, both resistors will carry the same current.

that current will be I = V/R = 12 / (10 + 10) = 0.6 A

The voltage drop across each resistor is V = IR = 0.6(10) = 6 V

6 0
3 years ago
Jake calculates that the frequency of a wave is 500 hertz and that the wave is moving at 1,250 m/s. What is the wavelength of th
Neko [114]
Frequency (f) = 500 hz (SI)
Velocity (V) = 1250 m/s (SI)
Wavelength (Lambda) = ? meters

v =  \lambda \times f
1250 =  \lambda \times 500 \\ \lambda = 1250 \div 500 \\ \lambda = 2.5 \: meters
6 0
3 years ago
Why do temperatures on the moons surface vary ncyb more than temperatures on earth
ollegr [7]

Answer:

The moon has no atmosphere

Explanation:

The temperatures on the surface of the Moon vary much more than those on Earth because the moon has no atmosphere (third answer in the list), and therefore there are no molecules that could retain residual heat and make the change from day to night a softer transition.

5 0
3 years ago
Other questions:
  • Assume an 8-kg bowling ball moving at 2m/s bounces off a spring at the same speed that it had before bouncing.What is the moment
    6·1 answer
  • A current of 3.60A flows for 15.3s through a conductor. Calculate the number of electrons that pass through a point in the condu
    15·1 answer
  • A fisherman notices that his boat is moving up and down periodically without any horizontal motion, owing to waves on the surfac
    5·1 answer
  • 6) A person with mass 50.0 kg, standing still, throws an object with mass 12.0
    9·1 answer
  • Seeing how strong our gravitational pull is here on Earth, would it be possible to kill someone if you drop a penny off the Empi
    6·1 answer
  • What is the force of an object in free fall
    8·2 answers
  • When working with electric charges, what symbol is used in equations to represent the electric field of an object?
    15·2 answers
  • If you pull on one end of a skateboard with a force of 10 N, and your friend pulls on the other end with a force of 10 N. What i
    15·1 answer
  • Forces can...
    13·1 answer
  • Many college students have a mini-fridge in their dorm room. A standard mini fridge costs roughly $100, uses about 100 watts of
    8·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!