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Energy required to break covalent bonds of DNA

NicoleisQuantizedNicoleisQuantized Posts: 344Member Member Posts: 344Member Member
For those of you who fear microwave radiation:

The wavelength of light that is needed to damage DNA lies in the higher energy regions of the electromagnetic spectrum, the higher end of the Ultra-violet (10 x 10^-9 m to 400 x 10^-9 m), the X-Ray (0.01 x 10^-9 to 10 x 10^-9 m), or the Gamma (< 0.02 x 10^-9 m).

Microwave light lies in the low energy region of the electromagnetic spectrum, or 1 mm to 1 m.

Furthermore, the photon energy required to break one of the chemical bonds of DNA, if we use the canonical equations relating the wavelength of light to the energy of a photon:

E = hν

where E is the energy (J, Joules which is a unit of energy), h is Plank's Constant (6.626 × 10-34 J s), and ν is the frequency (s^-1) of the wavelength of light. The frequency is also expressed in terms of the wavelength

ν= c/λ

where c is the speed of light (2.9979 x 10^8 m/s) and λ is the wavelength of light (in meters, m).

So, the energy for a photon is

E = hc/λ

Plugging in the values for the speed of light, Plank's constant, and the higher enery end of the Microwave region, or 1 mm (1 x 10^-3 m), the energy of a photon is

E = [(6.626 x 10^-34 Js)(2.9979 x 10^8 m/s)]/ (1 x 10^-3 m) = 1.986 x 10^-22 J

Similarly, the energy of a photon in the lower and upper regions of the Electromagnetic spectrum are

E = [(6.626 x 10^-34 Js)(2.9979 x 10^8 m/s)]/ (400 x 10^-9 m) = 4.966 x 10^-19 J

E = [(6.626 x 10^-34 Js)(2.9979 x 10^8 m/s)]/ (10 x 10^-9 m) = 1.986 x 10^-17 J.

The energy required to break the covalent bonds (the class of bond that exists between all of the atoms in DNA), the most common being carbon-hydrogen (C-H), carbon-carbon (C-C), and carbon-nitrogen (C-N) have bond energies 413, 348, and 308 kJ/mol, respectively ( a mol means 6.022 x 10^23 constituent particles or atoms per mol; a mol is a unit).

So, the energy in the weakest bond (in this case the carbon-nitrogen bond) is

E = (308 x 10^3 J/mol)/(6.022 x 10^23 mol^-1) = 5.115 x 10^-19 J

THEREFORE, you need to be in the Ultra-violet region of the electromagnetic spectrum.
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Replies

  • Kathy_TheVampireSlayerKathy_TheVampireSlayer Posts: 196Member Member Posts: 196Member Member
  • csuharcsuhar Posts: 782Member Member Posts: 782Member Member
    Okay. Now the subject makes sense. I was originally pretty stumped by why we were talking about covalent bonds on MFP.
  • IronSmasherIronSmasher Posts: 4,061Member Member Posts: 4,061Member Member
    Waves are too big
  • Sarauk2sfSarauk2sf Posts: 28,493Member Member Posts: 28,493Member Member
    I like it...I have no idea what it says, but I like it!
  • MoreBean13MoreBean13 Posts: 9,175Member Member Posts: 9,175Member Member
  • Chief_RockaChief_Rocka Posts: 4,785Member Member Posts: 4,785Member Member
    Now you've got me all hot and bothered
  • drmercdrmerc Posts: 2,808Member Member Posts: 2,808Member Member
    I was just thinking the same thing
  • etoiles_argenteesetoiles_argentees Posts: 2,853Member Member Posts: 2,853Member Member
  • sunsnstatheartsunsnstatheart Posts: 2,599Member Member Posts: 2,599Member Member
    I don't fear microwave radiation but I would fear a test on that^.
  • infamousmkinfamousmk Posts: 6,153Member Member Posts: 6,153Member Member
    I use microwaves to heat hot toddies.
  • WendyTerry420WendyTerry420 Posts: 13,349Member Member Posts: 13,349Member Member
    I hope this means that microwaves are safe. Lots of crazy threads on microwaves lately.

    tumblr_manxt3CV0U1r76lino1_500.gif
  • cmcollins001cmcollins001 Posts: 3,550Member Member Posts: 3,550Member Member
    There are these numbers and letters n stuff...and they mean really cool things...and then bad people go to jail, and good people live forever and eat out of microwaves!!!!

    Numb3rs_guy.jpg
  • Duck_PuddleDuck_Puddle Posts: 2,549Member, Premium Member Posts: 2,549Member, Premium Member
    I don't fear microwaves, but I fear engineers and anyone else who thought differential equations and linear algebra were "fun" courses.
  • MoreBean13MoreBean13 Posts: 9,175Member Member Posts: 9,175Member Member
    I don't fear microwaves, but I fear engineers and anyone else who thought differential equations and linear algebra were "fun" courses.

    I'm an engineer. DiffEq was NOT fun. Just for the record.

    Physical chemistry was fun. We blew stuff up.
  • Duck_PuddleDuck_Puddle Posts: 2,549Member, Premium Member Posts: 2,549Member, Premium Member
    I don't fear microwaves, but I fear engineers and anyone else who thought differential equations and linear algebra were "fun" courses.

    I'm an engineer. DiffEq was NOT fun. Just for the record.

    Physical chemistry was fun. We blew stuff up.

    Oh good! You're infinitely less frightening than the engineers I've known irl. I'm not big on blowing things up-but to each his or her own-as long as we agree that differential equations is not a good time-then we have common ground.
  • Awkward30Awkward30 Posts: 1,927Member Member Posts: 1,927Member Member
    I don't fear microwaves, but I fear engineers and anyone else who thought differential equations and linear algebra were "fun" courses.

    I'm an engineer. DiffEq was NOT fun. Just for the record.

    Physical chemistry was fun. We blew stuff up.

    Magnesium?
  • GiddyupTimGiddyupTim Posts: 2,769Member Member Posts: 2,769Member Member
    So, you can put the cat in there . . . .
  • MarieAnneNMarieAnneN Posts: 205Member Posts: 205Member
    Ok, I don't know squat about chemistry and physics aside E=MC2... But this thread is getting really interesting! :)
  • MerrychrissmithMerrychrissmith Posts: 326Member Member Posts: 326Member Member
    I am invoking the Heisenberg uncertainty principle as well as the second law of thermodynamics in understanding this.....hmmm,,, seems reasonable.
  • MerrychrissmithMerrychrissmith Posts: 326Member Member Posts: 326Member Member
    So, you can put the cat in there . . . .

    Schrodingers?
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