Units


Moderators: Chem_Mod, Chem_Admin

Henry Krasner 1C
Posts: 64
Joined: Fri Sep 28, 2018 12:15 am

Units

Postby Henry Krasner 1C » Thu Oct 18, 2018 11:38 pm

What unit does J.s^(-1) translate into, and how would we use this new unit to calculate the correct unit for finding wavelength, in say, the equation of λ=h (unit of J.s^(-1)/mv?

Summer de Vera 2C
Posts: 65
Joined: Fri Sep 28, 2018 12:16 am

Re: Units

Postby Summer de Vera 2C » Thu Oct 18, 2018 11:40 pm

It translates into kgm^2/s because a joule is kgm^2/s^2, and if you divide it by 1/s, it gets to this unit.

804994652
Posts: 68
Joined: Fri Sep 28, 2018 12:26 am

Re: Units

Postby 804994652 » Sun Oct 21, 2018 1:32 pm

1 joule = 1kg·m^2·s^-2
If you divide it by s-1. One of the 's' cancels out and you get 1kg·m^2·s^-1.

Jchellis 1I
Posts: 61
Joined: Fri Sep 28, 2018 12:15 am

Re: Units

Postby Jchellis 1I » Sun Oct 21, 2018 9:14 pm

Its important to remember that we use kg instead of grams for SI units. I know I always forget!

Tatum Keichline 2B
Posts: 64
Joined: Fri Sep 28, 2018 12:26 am

Re: Units

Postby Tatum Keichline 2B » Mon Oct 22, 2018 12:19 am

Joule is kgm^2/s^2, but multiplying my 1/s cancels one of the s units, making kgm^2/s

Mhun-Jeong Isaac Lee 1B
Posts: 54
Joined: Fri Sep 28, 2018 12:17 am

Re: Units

Postby Mhun-Jeong Isaac Lee 1B » Mon Oct 22, 2018 2:55 am

Just another reminder too is that Herz = s^-1. I find it helpful to convert Hz to s^-1 so that if units are being multiplied or divided, it's easier to see how things cancel out.

Daniel Chang 3I
Posts: 33
Joined: Fri Sep 28, 2018 12:23 am

Re: Units

Postby Daniel Chang 3I » Thu Oct 25, 2018 10:13 am

a Joule multiplied by 1/s is composed of 1kgm^2/s in its simplest form

105002507
Posts: 30
Joined: Fri Sep 28, 2018 12:15 am

Re: Units

Postby 105002507 » Thu Oct 25, 2018 7:36 pm

When do we use kg?

Amy Dinh 1A
Posts: 62
Joined: Fri Sep 28, 2018 12:23 am

Re: Units

Postby Amy Dinh 1A » Thu Oct 25, 2018 8:07 pm

105002507 wrote:When do we use kg?


We use kg when we are calculating energy, since the units are in jules (kg·m^2·s^-2)

lukezhang2C
Posts: 59
Joined: Fri Sep 28, 2018 12:18 am

Re: Units

Postby lukezhang2C » Thu Oct 25, 2018 11:14 pm

It should follow e=mc^2 for photons, which is kgm^2/s^2

duverge_maciel
Posts: 21
Joined: Fri Sep 28, 2018 12:16 am

Re: Units

Postby duverge_maciel » Sun Nov 04, 2018 11:28 pm

If a calculation is in Hz, does that mean it will always be a positive value?


Return to “Einstein Equation”

Who is online

Users browsing this forum: No registered users and 1 guest