9.3 & 9.4

Thermionic emission is a process of emission of charge particle from the surface of a heated metal. The charge particle emitted is also known as (a)   .

In particle accelerator, electric field is used to ...

• speed up and increase the energy of particles

• steer and focus the particles

• slow down and decrease the energy of particles

• disperse and diffuse the particle

In particle accelerator, magnetic field is used to ...

• speed up and increase the energy of particles

• steer and focus the particles

• slow down and decrease the energy of particles

• disperse and diffuse the particle

Which of the followings are particle accelerator?

• LINAC

• Cyclotron

• Cloud Chamber

• Ionisation Chamber

Which of the followings are particle detector?

• LINAC

• Cyclotron

• Cloud Chamber

• Ionisation Chamber

Why high energy is needed to investigate the structure of nucleon?

• so that the wavelength is increased hence we get a finer details

• so that the wavelength is decreased hence we get a finer details

A (a)   particle is one which cannot be broken down into anything else.

The particles in the standard model can be put into two groups that is ...

• fermions and bosons

• baryons and mesons

• fermions and leptons

• thermions and bosons

an electron with a positive charge

• neutrino

• gauge boson

• positron

• gluon

along with leptons and fundamental bosons, these make up the elementary particles of the standard model

• quark

• meson

• baryon

• hadron