## Einstein Equation

$E=hv$

Yazmin Bocanegra 3L
Posts: 51
Joined: Thu Jul 25, 2019 12:17 am

### Einstein Equation

What do the "h" and "v" stand for in Einstein's equation, E=hv?

Michael Nguyen 1E
Posts: 120
Joined: Sat Aug 17, 2019 12:17 am

### Re: Einstein Equation

The h stands for Planck's constant, which is provided on the constants sheet.
The v stands for the frequency of EM radiation that is being used in the calculation.

105289321
Posts: 49
Joined: Sat Sep 07, 2019 12:15 am

### Re: Einstein Equation

Plancks constant and frequency

Leyla Anwar 3B
Posts: 95
Joined: Wed Sep 30, 2020 10:03 pm

### Re: Einstein Equation

In E=hv,
h = planck's constant --> 6.626 x 10^-34 ; since this is a constant it will always be this value
v = frequency (Hz)

Michael Sun Dis 3G
Posts: 50
Joined: Wed Sep 30, 2020 9:37 pm

### Re: Einstein Equation

The "h" is Planck's constant, around 6.626x10^-34 Js. The "v" is the frequency of the photon.

Becca Nelson 3F
Posts: 109
Joined: Wed Sep 30, 2020 9:52 pm

### Re: Einstein Equation

These variables are h for Planck's constant (6.6.26 x 10^-34) and v for frequency. The v for frequency can also be seen in c=(wavelength)(v). With the only terms in E=hv being a constant and v, we see how it does not matter the intensity of the light but only the frequency. This goes back to Dr. Lavelle's analogy about the cross country runners and the barrier. Hope this helps :)

Crystal Pan 2G
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Joined: Wed Sep 30, 2020 10:04 pm
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### Re: Einstein Equation

E= hv

h= planck's constant $6.626*10^{-34}J.s$

v(nu)= frequency (Hz or $s^{-1}$)

Jason_John_2F
Posts: 91
Joined: Wed Sep 30, 2020 9:54 pm

### Re: Einstein Equation

h is planck's constant which is always 6.62607015×10−34 js and v is the frequency which is how often a wave passes a given point per second.

Sophia Kalanski 1A
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### Re: Einstein Equation

h stands for the plank constant and the v stands for the frequency. You can also, if you need to find the wavelength, use the frequency (v) and rewrite it as c/wavelength. This will get you E=hc/wavelength. C is the speed of light in the vacuum which is a constant and it is 3.00*10^8

LeanneBagood_2F
Posts: 96
Joined: Wed Sep 30, 2020 9:32 pm

### Re: Einstein Equation

Adding on to this question, is there a specific way we should be writing the "v" or frequency in the equation E = hv? Every lecture I get a bit confused because the symbol for frequency looks exactly like "v" for velocity and i'm not too sure how to make a distinction.

Hasan Mirza 3F
Posts: 95
Joined: Wed Sep 30, 2020 10:00 pm

### Re: Einstein Equation

The ν used for frequency is the greek letter "nu" which looks almost identical to a v. I think for the most part problems should be pretty clear on what is being asked for, such as when a wavelength is given.