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
AleksandrR [38]
3 years ago
7

An electron in a hydrogen atom relaxes to the n=4 level, emitting light of 74 THz.

Chemistry
1 answer:
Solnce55 [7]3 years ago
6 0
Delta E = Ef - Ei
E = energy , h = plank constant  , v = frequency
h= 6.626 * 10 ^-34 j*s  ,  T = 10 ^ 12  , v = 74 * 10 ^12 Hz  ,  Hz = s^-1 

E = ( 6.626 * 10^ -34 j*s) ( 74 * 10 ^ 12 s^ -1 )  =   4.90 * 10 ^ -20 J
Delta E  = Ef  -  Ei
-4.90 * 10 ^ -20 J =  -2.18 * 10 ^ -18J ( 1/4 ^2 - 1/x ^2)
0.0225 = 0.0625 -  ( 1/x ^ 2)
0.225 - 0.0625 =  - 1/ x ^ 2 

- 0.0400 = - 1/x ^2    =   -1 / - 0.0400    =   x^2
25   =  x^2 
     x = 5 




You might be interested in
Which of the following is a direct observation? A. Music may help plants grow B. The plant is 22cm on day 23 C. two plants must
Marizza181 [45]
The answer is B for number 1 because rather than it being an observation it is something that you know for sure happened without guessing. 

the answer is B the researcher is actually adding the fertilizer and measuring it.
8 0
3 years ago
Read 2 more answers
Whats the difference between whitecap and swell
scoray [572]
Whitecap waves are caused by the wind, while swells are caused by surface gravity.
6 0
2 years ago
The base unit of a measured liquid called volume is?
Dafna1 [17]
The answer you need is Volume.
8 0
3 years ago
What is empirical and moleculer formula?.
den301095 [7]
The molecular formula shows the exact number of molecules. Therefor, the empirical formula is the simplest formula of the molecular formula
4 0
3 years ago
How many miles can a commercial jetliner flying at 253 meters per second travel in 6.0 hours?
omeli [17]
The Jetliner will travel a total of 1518 meters if flying for 6 hours.
6 0
2 years ago
Read 2 more answers
Other questions:
  • If there is 30 grams of O2 how many grams of CO2 can it make
    12·1 answer
  • What kind of pizza thooe? -. -
    11·1 answer
  • What are two effects of too much exposure to radiation?
    5·1 answer
  • What volume measured in stp will 3.75 grams of helium gas occupy?
    7·1 answer
  • How many moles of solute are contained in a 250 ml solution that has a concentration of.85 m?
    13·1 answer
  • A bat is swung at 5.5m/s. The bat weighs 6kg. What is the energy? ______ kg*m/s
    10·1 answer
  • If a substance has a density of 1.345g / mL , how many grams would the substance weigh if the sample has a volume of 22.1 ml?
    15·1 answer
  • Please help me!<br>Will give the brainliest!<br>Please answer correctly.<br>Really urgent!!​
    15·1 answer
  • 1) A book is pushed and released and it slides across a table for a short distance The book quickly comes to a stop. The book or
    7·1 answer
  • High-temperature superconducting oxides hold great promise in the utility, transportation, and computer industries.
    15·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!