Moodle-1 ECE-202-2023

Dual nature of matter was mathematically proved by

• Max Planck

• de-Broglie

• Compton

• Einstein

λ = h / p, Here ‘p’ represents

• Mass

• Velocity

• Momentum

• Acceleration

Quantum physics deals with the behavior of matter and light on

• Atomic and subatomic level

• Only atomic level

• Only sub atomic level

• None of the above

Macroscopic optical phenomena like interference, diffraction and polarisation reveal and confirm

• Particle nature of electromagnetic radiations

• Wave nature of electromagnetic radiations

• Dual nature 

• None of the above

Classical theory of radiation failed to explain photoelectric effect; however this phenomenon was explained on the basis of quantum theory by

• Albert Einstein

• Compton

• Rutherford

• Max Planck

According to Max Planck the energy emitted by a black body is in the form of discrete packets known as

• Photons

• Electrons

• Neutron

• Protons

Classical theory fails to explain 

• the stability of an atom

• the spectrum of a hydrogen atom

• photoelectric effect

• All the above

Calculate the de-Broglie wavelength of an electron accelerated by a potential of 1 kV.

• 1.227 Aº

• 0.3880 Aº

• 12.27 Aº

• 38.80 Aº

Calculate the momentum of photon of energy E= 100eV.

• 7.61x10-26 kg m sec-1

• 4.21x10-14 kg m sec-1

• 5.00x10-28 kg m sec-1

• 5.33x10-26 kg m sec-1

Calculate de-Broglie wavelength of the neutron of energy 28.8 eV.

• 0.0126 A0

• 1.0269x10-9m

• 0.0534 A0

• 2.0418 µm