14th Nov Dual Nature of Radiation and Matter Quiz 1 – Punjab Meritorious School Preparation Portal

Welcome to your 14th Nov Dual nature of Radiation and Matter Quiz 1 CBT TEST

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In the phenomenon of electric discharge through gases at low pressure, the colored glow in the tube appears as a result of:

excitation of electrons in the atoms

collision between the atoms of the

collisions between the charged particles emitted from the cathode and the atoms of the gas

collision between different electrons of the atoms of the gas

Which of the following figures represents the variation of particle momentum and the associated de-Broglie wavelength?

Which of the following moving particles (moving with same velocity) has largest wavelength of matter waves?

Electron

α-particle

Proton

Neutron

The de-Broglie wavelength of neutron in thermal equilibrium at temperature T is:

An electron of mass m and a photon have same energy E. The ratio of de-Broglie wavelengths associated with them is:

Light of frequency 1.5 times the threshold frequency is incident on a photosensitive material. What will be the photoelectric current if the frequency is halved and intensity is doubled?

four times

one-fourth

zero

doubled

A particle of mass 1 mg has the same wavelength as an electron moving with a velocity of 3×10⁶ ms^-1 The velocity of the particle is:

(mass of electron = 9.1 × 10^-31 ms^-1)

Electrons used in an electron microscope are accelerated by a voltage of 25 kV. If the voltage is increased to 100kV then the de-Broglie wavelength associated with the electrons would

increase by 2 times

decrease by 2 times

decrease by 4 times

increase by 4 times

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