# Need help calculating frequency

1. Jun 14, 2005

### middleearth77

Join Date: Jun 2005
Posts: 1
Read my Journal nd hlp. calculating frequency

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I have a problem that states as follows:

Calculate the frequency (in Hz) of energy of 3.5 x 10^-14 joules. (c=3.00 x 10^8 m/s; h=6.63 x 10^-34 joule-seconds)

I need help in setting this problem up. I found the equation E=hv, where E= the increase of energy, h= planck's constant, and v= the freqency of light which increases propportionally with an increase in energy.

I am going crazy and just don't get it...........

2. Jun 14, 2005

### whozum

$$E = h\nu \Rightarrow \nu = \frac{E}{h}$$

$$E = 3.5 \times 10^{-14} J, h = 6.63 \times 10^{-34} J\cdot s$$

Problem?

3. Jun 14, 2005

### Nereid

Staff Emeritus
Welcome to Physics Forums, middleearth77!

This sounds like a homework problem, so I'm moving it to the appropriate section.