Table of Contents

- 1 What is the relation between energy and momentum of photon?
- 2 Can a photon and an electron of the same momentum have the same wavelength compare their wavelengths if the two have the same energy?
- 3 What is the difference between a proton and a photon Class 11?
- 4 What is the relationship between an electron and a photon?
- 5 How is Energy conserved in a collision between an electron and photon?

## What is the relation between energy and 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.

**What is the difference between protons and photons?**

The names are very similar — photon versus proton — but there is a world of difference. Photons, or X-Rays, are pure energy and have no mass (although Einstein would disagree as energy does have mass). Protons have energy and are relatively massive and heavy. Think of photons as “fluffy” and protons as “portly.”

**What is the kinetic energy of a proton that has the same momentum as a 1 MeV photon?**

Answer and Explanation: Given- The energy of the photon is E=1 MeV=1.6×10−13 J E = 1 MeV = 1.6 × 10 − 13 J .

### Can a photon and an electron of the same momentum have the same wavelength compare their wavelengths if the two have the same energy?

Wavelength (λ)=hmv=hp. Therefore for same wavelength of electrons and photons, the momentum should be same.

**What is the relationship between momentum and energy?**

In short, momentum is proportional to the square root of kinetic energy since momentum is directly proportional to velocity, while kinetic energy is proportional to velocity squared. This means that if kinetic energy becomes four times as big, the momentum will only double.

**What’s the difference between momentum and energy?**

Some people think momentum and kinetic energy are the same. They are both related to an object’s velocity (or speed) and mass, but momentum is a vector quantity that describes the amount of mass in motion. Kinetic energy is a measure of an object’s energy from motion, and is a scalar.

#### What is the difference between a proton and a photon Class 11?

Proton is a positively charged particle having a finite non zero mass ,which forms the positive part of the atom. Photon is assumed to be a mass less particle through which energy transfers when light propagates. Photons are discrete packets having finite energy.

**What is the difference between quantum and photon Class 11?**

A quantum is the tiniest particle of a substance that may exist. An electron, for example, is the tiniest particle of negatively charged matter possible, just as a photon is the tiniest particle of light possible. A photon is an elementary particle, but a quantum is a discrete packet containing energy.

**Do electron and photon have the same momentum?**

So, yes, a photon or an electron qualified by a wavelength do exhibit the same momentum.

## What is the relationship between an electron and a photon?

Electrons have a negative charge, which means only that they move away from other negatively charged matter (other electrons) and are drawn to positively charged matter (protons, often ones in the nuclei of atoms). But photons are units (packets of energy) of an electromagnetic wave. They are not bits of matter.

**Do photons have energy and momentum?**

Convincing evidence that light is made up of particles (photons), and that photons have momentum, can be seen when a photon with energy hf collides with a stationary electron. Some of the energy and momentum is transferred to the electron (this is known as the Compton effect), but both energy and momentum are conserved in this elastic collision.

**Why do photons have p = mv?**

The classical p = mv is a great description for massive objects, because their energy and momentum do correspond directly to their motion. With massless particles, which have constant speed (c) and no mass, this is obviously no longer sufficient. Because photons posses energy, they have the ability to impart force.

### How is Energy conserved in a collision between an electron and photon?

Some of the energy and momentum is transferred to the electron (this is known as the Compton effect), but both energy and momentum are conserved in this elastic collision. After the collision the photon has energy hf / and the electron has acquired a kinetic energy K. Conservation of energy: hf = hf / + K.

**What happens to energy and momentum in Compton effect?**

The Compton Effect. Some of the energy and momentum is transferred to the electron (this is known as the Compton effect), but both energy and momentum are conserved in this elastic collision. After the collision the photon has energy hf / and the electron has acquired a kinetic energy K.