De-Broglie equation states the:
  • dual nature
  • particle nature
  • wave nature
  • none of these
Protons and alpha particles have the same de-Broglie wavelength. What is same for both of them?
  • Energy
  • Time period
  • Frequency
  • Momentum
Kinetic energy of emitted electrons depends upon :
  • frequency
  • intensity
  • nature of atmosphere surrounding the electrons
  • none of these
De-Broglie wavelength of a body of mass m and kinetic energy E is given by (symbols have their usual meanings):
  • \(\frac{h}{\sqrt{2mE}}\)
  • \(\frac{h}{2mE}\)
  • \(\frac{\sqrt{2mE}}{h}\)
  • \(\frac{h}{mE}\)
The ratio of specific charge of an alpha particle to the proton is:
  • 1 : 2
  • 2 : 1
  • 4 : 1
  • 1 : 4
In Thomson's experiment number of parabola gives :
  • the no. of electrons present in element
  • the no. of proton present in element
  • the no. of neutrons present in element
  • the no. of isotopes of the element present
The work function of photoelectric material is 3.3 eV. The threshold frequency will be equal to:
  • 8 × 1014 Hz
  • 8 × 1010 Hz
  • 5 × 1010 Hz
  • 4 × 1014 Hz
The strength of photoelectric current depends upon :
  • angle of incident radiation
  • frequency of incident radiation
  • intensity of incident radiation
  • distance between anode and cathode
The momentum of an electron that emits a wavelength of 2 Å. will be:
  • 6.4 × 10-36 kgms-1
  • 3.3 × 10-24 kgms-1
  • 3.3 × 10-34 kgms-1
  • none of these
Name the scientists who first studied the passage of electricity through fluids to establish the electrical nature of matter:
  • Millikan
  • Planck
  • Faraday
  • Boyle
Millikan's oil drop experiment makes use of:
  • Stokes' law
  • Boyle's law
  • Gas equation
  • Bernoulli's theorem
X-rays are:
  • deflected by an electric field
  • deflected by a magnetic field
  • deflected by both electric and magnetic fields
  • not deflected by electric and magnetic fields
In photo electric emission, for alkali metals the threshold frequency lies in the:
  • visible region
  • ultraviolet region
  • infrared region
  • far end of the infrared region
Which of the following radiations cannot eject photo electrons?
  • ultraviolet
  • infrared
  • visible
  • X-rays
What is the de-Broglie wavelength of an electron accelerated from rest through a potential difference of V volts?
  • \(\frac{12.3}{V^2}\) Å
  • \(\frac{12.3}{V}\) Å
  • \(\frac{12.2}{V^2}\) Å
  • None of these
What is the de-Broglie wavelength of an electron accelerated from rest through a potential difference of 100 volts?
  • 12.3 Å
  • 1.23 Å
  • 0.123 Å
  • None of these
What is the de-Broglie wavelength of a proton accelerated from rest through a potential difference of V volts?
  • \(\frac{12.3}{√V}\) Å
  • \(\frac{12.3}{V}\) Å
  • \(\frac{12.2}{V^2}\) Å
  • None of these
When a yellow light is incident on a surface, no electrons are emitted while green light can emit electrons. If the red light is incident on the surface then:
  • no electrons are emitted
  • photons are emitted
  • electrons of higher energy are emitted
  • electrons of lower energy are emitted
The de-Broglie wavelength of particle of mass 1 mg moving with a velocity of 1 ms-1, in terms of Planck's constant h, is given by (in metre):
  • 105 h
  • 106 h
  • 10-3 h
  • 103 h
Evidence of the wave nature of light cannot be obtained from:
  • diffraction
  • interference
  • doppler effect
  • reflection
0 h : 0 m : 1 s

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