What is the momentum of photon?

Photons have momentum, given by p=hλ p = h λ , where λ is the photon wavelength. Photon energy and momentum are related by p=Ec p = E c , where E=hf=hcλ E = h f = h c λ for a photon.

How does the momentum of a photon compare to the momentum of an electron of identical energy?

How does the momentum of a photon compare to the momentum of an electron of identical energy? Momentum of the photon is greater than the momentum of an electron. Momentum of the photon is less than the momentum of an electron. Momentum of the photon is equal to the momentum of an electron.

How do photons transfer momentum?

Particles carry momentum as well as energy. Despite photons having no mass, there has long been evidence that EM radiation carries momentum. Evidently, photons carry momentum in the direction of their motion (away from the Sun), and some of this momentum is transferred to dust particles in collisions.

Why is momentum H Lambda?

The Momentum of a Photon λ = wavelength of the wave carrying the photon in metres. Since the value of the “h” is low the momentum of the photon is negligible in most of the cases. This is evident from the fact that the mirror doesn’t recoil when the photons bounce off it.

Can a photon have momentum?

Light is composed of photons, so we could ask if the photon has mass. The answer is then definitely “no”: the photon is a massless particle. According to theory it has energy and momentum but no mass, and this is confirmed by experiment to within strict limits.

What happens when a photon hits a mirror?

Photons that strike the mirror head-on are reflected squarely back, and those hitting at an angle are reflected at the same angle in the other direction, forming a V-shaped path. This is the law of reflection.

Why does a photon have momentum but no mass?

Since photons (particles of light) have no mass, they must obey E = pc and therefore get all of their energy from their momentum. If a particle has no mass (m = 0) and is at rest (p = 0), then the total energy is zero (E = 0).

Can a photon and electron of same momentum have same wavelength?

Given, the wavelength of electrons and photons are the same. Thus , the velocity of electrons and protons will be the same . Hence, the required option is C – momentum.

Why photon has momentum but no mass?

Light indeed carries energy via its momentum despite having no mass. In contrast, for a particle with no mass (m = 0), the general equation reduces down to E = pc. Since photons (particles of light) have no mass, they must obey E = pc and therefore get all of their energy from their momentum.

What is Lambda equal to?

Wavelength, distance between corresponding points of two consecutive waves. Wavelength is usually denoted by the Greek letter lambda (λ); it is equal to the speed (v) of a wave train in a medium divided by its frequency (f): λ = v/f.

Is momentum of a photon zero?

The answer is then definitely “no”: the photon is a massless particle. According to theory it has energy and momentum but no mass, and this is confirmed by experiment to within strict limits.

How to derive the momentum of photons-Quora?

Relativity offers no answer to this question, but curiously enough, quantum mechanics does, in the form of Plank’s formula: [3] A moving photon has mass as follows from the Einstein formula E=mc2. [2] Physicists have not stopped on assumption of massless photon.

How is the momentum of a photon related to the scattering angle?

momentum of the scattered photon h/ 2 can be related to the initial momentum, the electron mass, and the scattering angle. The resulting Compton equation for the change in the wavelength of the x ray is Equation 3-25. E 1 = hf 1 E 2 = hf 2 p 1 = h/λ p 2 = h/λ 2 φ θ m p e = E 2 – E 0 1 –– c

How is the energy and momentum of photons conserved?

Energy and momentum are conserved in the collision. (See Figure 2) He won a Nobel Prize in 1929 for the discovery of this scattering, now called the Compton effect, because it helped prove that photon momentum is given by p = h λ p = h λ , where h is Planck’s constant and λ is the photon wavelength.

How did Compton calculate the momentum of a photon?

Compton saw the effects of photon momentum because he was observing x rays, which have a small wavelength and a relatively large momentum, interacting with the lightest of particles, the electron. Calculate the momentum of a visible photon that has a wavelength of 500 nm.