# Simple photon question pt 2

1. Aug 6, 2004

### mee

What exactly does the wavelength of a photon denote? Vibration, pulsation? Why does the smaller wavelengths connote higher energies? What is it about high energies that causes smaller wavelengths?

2. Aug 6, 2004

### marlon

A smaller wavelength corresponds to a higher frequency via the deBroglie-relations. This way of looking at a particle as if it were a wave is the basic property of QM. Just think of the amount of energy of a certain foton as represented by a wave with corresponding frequency.

3. Aug 6, 2004

### mathman

A simple way of looking at is E=hf, where E is energy, h is Planck's constant, and f is frequency. Frequency is inversely proportional to wavelength.

4. Aug 7, 2004

### mee

Thank you for showing what is the relationship, but why this relationship?

5. Aug 7, 2004

### so-crates

Remember that the speed of photons is the constant c. The speed of any wave is equal to the wavelength times the frequency, so c = lf. (l = lambda, the wavelentgth, f is frequency). Rearranging, f = c/l. If E = hf for a photon, then E = hc/l. So energy increaes with smaller l (wavelength).

Are you asking why c = lf, or why E = hf?

6. Aug 8, 2004

### mee

Sorry for my ignorance, but what is h and is time an integral part of f?

7. Aug 8, 2004

### µ³

Remember how light has properties of a wave (wave/particle duality)? Well that's what the wavelength is, the wavelength of the property aspect of the photon. This helps predict such outcomes as the interference pattern in double-slit experiments.

8. Aug 20, 2004

### mee

But is this property a variable pulsation or a movement side to side through space or both?

9. Aug 20, 2004

Staff Emeritus
The EM wave is a transverse vibration. No longitudinal component has ever been observed.

10. Aug 20, 2004

### sol2

Tidal Forces, Gravitational Waves

http://math.ucr.edu/home/baez/einstein/node5.html

11. Aug 21, 2004

### mee

I'm sorry but this doesn't answer my question very well. Could you explain a bit better? More details?