A continuum is spectrum is observed due to the following:
Once and electron is completely free from the nuclear it is no longer restricted to quantized discrete energy states
Electron takes up continuously the ordinary kinetic energy corresponding to its speed in free space
Both the reasons are correct
None of the two reasons are correct
Select correct statement based on Rutherford’s model:
Most of th4 space in an atom between the nucleus and the revolving electron is empty
Electrons are called planetary electrons
Protons give positive charge on the nucleus but nuclear mass is determined by protons and neutron both
All are correct statements
Which has maximum spin?
Electron
Proton
Neutron
Equal spin
Which is heaviest compared to that of electron?
(-meson
(-meson
Neutrino
Positron
Ratio of radius of atom to that of nucleus is of the order of:
10-10
10-15
105
10-5
The application of electric and magnetic field deflected certain rays in the discharge tube towards cathode. This proved that:
Electrons are negatively charged particles
Protons are positively charged particles
Neutrons are neutral particles
None of the above statements is true
Mass of the person is equal to that of:
Positron
Neutrino
Pion
Anti-proton
A near UV photon of 300 nm is absorbed by a gas and then re-emitted as two photons. One photon is red with wavelength 760 nm. Hence, wavelength of the second photon is:
460 nm
1060 nm
496 nm
300 nm
Which of the recent development has proved the existence of atoms?
Scanning tunneling microscopy
x-ray diffraction
Infrared spectroscopy
Mass spectroscopy
Select correct statement:
Visible light consists of electromagnetic waves of oscillating electric and magnetic fields
In vacuum, all types of electromagnetic radiations travels at the same speed
Both are correct statements
None is correct statement