Atomic Physics interview questions – page 2

The first excitation potential energy or the minimum energy required to excite the atom from ground state of hydrogen atom is ___

1. 1.89 eV
2. 13.6 eV
3. 10.2 eV
4. 3.4 eV

The potential required for conduction of electricity through a gas under low pressure is ____

1. 50 V
2. 500 V
3. 5000 V
4. 50,000 V

Retina of the eye is comparable to which of the following parts of a traditional camera?

1. Cover
2. Shutter
3. Lens
4. Film

The colour of the star is an indication of its

1. Distance from the sun
2. Luminosity
3. Temperature
4. Distance from earth

Who suggested that electrons are revolving around the nucleus in circular orbits?

1. Sommerfeld
2. Rutherford
3. Prout
4. J.J. Thomson

Who suggested that all elements are made up of atoms of hydrogen?

1. Rutherford
2. J.J. Thomson
3. Prout
4. Dalton

The length and diameter of the discharge tube used by J.J. Thomson is ___ respectively.

1. 25 cm and 4 cm
2. 50 cm and 4 cm
3. 75 cm and 8 cm
4. 60 cm and 6 cm

Gases do not conduct electricity because ____

1. They have free electrons
2. They do not have free electron
3. They are made up of molecules
4. They are in random motion

In an X-ray tube, the intensity of the emitted X-ray beam is increased by ____

1. Increasing the filament current
2. Decreasing the filament current
3. Increasing the target potential
4. Decreasing the target potential

Cathode rays ____

1. Affect the photographic plates
2. Are deflected by electric and magnetic fields
3. Are deflected by electric field only
4. Both (a) and (b)

A micro wave opens uses wave with a

1. large wavelength in the invisible range
2. large wavelength in the visible range
3. small wavelength in the visible range
4. small wavelength in the invisible range

Who studied the diffraction of X-rays?

1. Laue
2. Coolidge
3. Roentgen
4. W.L.Bragg and W.H.Bragg

According to electromagnetic theory, the vibrating electron ____

1. Disturbs the stability of the atom
2. Loses its mass
3. Radiates energy
4. Falls into the nucleus

An accelerating electron radiates energy at a frequency proportional to the ___ of the electron.

1. Wavelength
2. Velocity
3. Angular velocity
4. Mass

____ is used to diffract X-rays.

1. Concave mirror
2. Convex lens
3. Optical grating
4. Crystal

____ are used to destroy tumors very deep inside the body.

1. Soft X-rays
2. Hard X-rays
3. Positive rays
4. Cathode rays

X-rays travel in ___

1. Circular paths
2. Parabolic paths
3. Straight lines
4. Curved paths

X-rays were discovered by ____

1. Roentgen
2. J.J. Thomson
3. Neil Bohr
4. Rutherford

The elliptical orbits of electron in the atom were proposed by ___

1. De Broglie
2. Sommerfeld
3. Bohr
4. J.J. Thomson

Who developed ruby laser?

1. Moseley
2. T. Maiman
3. Huygens
4. Roentgen

Laser beam is a _____

1. Monochromatic coherent beam of light
2. Monochromatic incoherent beam of light
3. Beam of white light
4. None of these

____ are used in endoscopy.

1. Positive rays
2. Laser beams
3. Radioactive rays
4. Cathode rays

Among the following radiations, which has the highest energy?

1. Infrared
2. Ultraviolet
3. X-ray
4. Visible

E = MC2, ‘c’ denotes

1. wavelength of light
2. a constant factor
3. velocity of light
4. velocity of sound

The arrangement to study the conduction of electricity through gases is ____

1. Vacuum tube
2. Discharge tube
3. Coolidge tube
4. None of the above

X-ray is ____

1. Principle of conservation of charge
2. Conversion of energy into mass
3. Conversion of momentum
4. Phenomenon of conversion of kinetic energy into radiation

Goldstein used a ___ to obtain canal rays.

1. Insulated anode
2. Perforated cathode
3. Insulated cathode
4. Perforated anode

The mass of each positive ion in the discharge tube is equal to the mass of the ___

1. Atom
2. Molecule
3. Neutron
4. Proton

The terminal velocity of the oil drop in Millikan’s experiment is found using ____

1. Speedometer
2. Telescope
3. Microscope
4. Metre scale

Laser stands for ____

1. Light amplification by stimulated emission of radiation
2. Light amplification by scattering of radiation
3. Light accelerated by the emission of electron
4. Light amplification by the emission of photon