Question

Can the following quantities be measured or calculated for light waves and subatomic particles, why or why not ?

Momentum:
Velocity:
Frequency:
Energy:

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Answer 1

Answer on Question #83694, Physics / Electromagnetism

Question:

Can the following quantities be measured or calculated for light waves and subatomic particles, why or why not?

Momentum:

Velocity:

Frequency:

Energy:

Solution:

Energy: sure can, for both subatomic particles and light particles, named photons; the energy value is $E = mc^2$ , where $m$ - mass of a particle.

Frequency: this parameter is applied for light or photons, in the last case the frequency can be calculated as $\nu = \frac{E}{h}$ , h - Plank constant. For subatomic particles this term normally isn't used, although a wavelength is often used, so called de Broil wavelength.

Velocity: obviously can in both cases, although for subatomic particles there are some restrictions associated with Heisenberg uncertainty principle.

Momentum: it can be measured or calculated both for photons and particle by mean of well-known relation $p = mv$ , where $m$ is the actual mass and $v$ – the velocity; all photons have the same velocity $c$ in vacuum.

The answer:

Please see above.

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