Who discovered electrons
J.J. Thomson

Who stated the uncertainty principle ?
W Heisenberg

Who discovered X rays ?
WK Roentgen

What is the expansion of LASER ?
Light Amplification by Stimulated Emission of Radiation

Name the particle that has the highest velocity ?
Photon

Who discovered neutrons ?
J Chadwick

What is Zeeman effect ?
Splitting of spectral lines by magnetic field

What is the instrument is used to measure the atmospheric pressure ?
Barometer

What is the SI unit of pressure ?
Pascal (Pa)

What is the melting point of ice in Kelvin ?
273 K