Modern Physics

Q. What is the band gap energy of a typical semiconductor?
  • A. 0 eV
  • B. 1-3 eV
  • C. 5 eV
  • D. 10 eV
Q. What is the band gap energy of a typical silicon semiconductor?
  • A. 0.1 eV
  • B. 1.1 eV
  • C. 2.0 eV
  • D. 3.5 eV
Q. What is the band gap energy of silicon at room temperature?
  • A. 0.1 eV
  • B. 1.1 eV
  • C. 2.0 eV
  • D. 3.5 eV
Q. What is the bandwidth of a signal that has a frequency range from 300 Hz to 3 kHz?
  • A. 2.7 kHz
  • B. 3.3 kHz
  • C. 2.4 kHz
  • D. 3.0 kHz
Q. What is the bandwidth of a signal that occupies a frequency range from 1 kHz to 3 kHz?
  • A. 1 kHz
  • B. 2 kHz
  • C. 3 kHz
  • D. 4 kHz
Q. What is the bandwidth of a signal that occupies a frequency range from 300 Hz to 3 kHz?
  • A. 2.7 kHz
  • B. 3.3 kHz
  • C. 2.4 kHz
  • D. 3.0 kHz
Q. What is the binding energy of a nucleus?
  • A. Energy required to remove a nucleon
  • B. Energy released during nuclear fusion
  • C. Energy required to split the nucleus
  • D. Energy required to form the nucleus from its constituents
Q. What is the binding energy per nucleon for a stable nucleus?
  • A. Less than 1 MeV
  • B. About 8 MeV
  • C. More than 10 MeV
  • D. Zero
Q. What is the critical mass in nuclear fission?
  • A. Mass required for a chain reaction
  • B. Mass of a single nucleus
  • C. Mass of the entire reactor
  • D. Mass of fuel rods
Q. What is the critical mass in nuclear physics?
  • A. Mass required for a stable nucleus
  • B. Mass required to sustain a nuclear chain reaction
  • C. Mass of a neutron
  • D. Mass of a proton
Q. What is the de Broglie wavelength of an electron moving with a velocity of 1.5 x 10^6 m/s? (mass of electron = 9.11 x 10^-31 kg)
  • A. 4.86 x 10^-10 m
  • B. 2.42 x 10^-10 m
  • C. 1.33 x 10^-10 m
  • D. 6.63 x 10^-10 m
Q. What is the effect of doping a semiconductor with acceptor impurities?
  • A. Increases electron concentration
  • B. Increases hole concentration
  • C. Decreases conductivity
  • D. No effect
Q. What is the effect of doping a semiconductor with donor atoms?
  • A. Increases hole concentration
  • B. Increases electron concentration
  • C. Decreases conductivity
  • D. Creates a depletion region
Q. What is the effect of doping a semiconductor with trivalent atoms?
  • A. Creates n-type
  • B. Creates p-type
  • C. No effect
  • D. Increases resistance
Q. What is the effect of doping a semiconductor?
  • A. Increases resistance
  • B. Decreases resistance
  • C. No effect
  • D. Makes it an insulator
Q. What is the effect of doping on the conductivity of a semiconductor?
  • A. Decreases conductivity
  • B. Increases conductivity
  • C. No effect
  • D. Makes it an insulator
Q. What is the effect of doping on the conductivity of semiconductors?
  • A. Decreases conductivity
  • B. Increases conductivity
  • C. No effect
  • D. Makes it insulative
Q. What is the effect of increasing the bandwidth of a communication channel?
  • A. Increased data rate
  • B. Decreased data rate
  • C. No effect on data rate
  • D. Increased noise
Q. What is the effect of increasing the frequency of incident light on the photoelectric current?
  • A. Increases indefinitely
  • B. Decreases
  • C. Remains constant
  • D. Increases until a threshold frequency is reached
Q. What is the effect of increasing the intensity of light on the energy of emitted electrons in the photoelectric effect?
  • A. It increases the energy
  • B. It decreases the energy
  • C. It does not affect the energy
  • D. It can either increase or decrease the energy
Q. What is the effect of increasing the intensity of light on the energy of emitted photoelectrons?
  • A. Increases energy
  • B. Decreases energy
  • C. No effect on energy
  • D. Energy becomes negative
Q. What is the effect of increasing the intensity of light on the maximum kinetic energy of the emitted electrons?
  • A. It increases
  • B. It decreases
  • C. It remains the same
  • D. It becomes zero
Q. What is the effect of increasing the intensity of light on the maximum kinetic energy of emitted electrons?
  • A. It increases
  • B. It decreases
  • C. It remains the same
  • D. It becomes zero
Q. What is the effect of increasing the transmission power in a communication system?
  • A. Increased range
  • B. Decreased noise
  • C. Higher bandwidth
  • D. Lower distortion
Q. What is the effect of increasing the wavelength of incident light on the photoelectric effect?
  • A. More electrons are emitted
  • B. Fewer electrons are emitted
  • C. The kinetic energy of emitted electrons increases
  • D. The work function decreases
Q. What is the effect of increasing the wavelength of incident light on the photoelectric current?
  • A. It increases the current
  • B. It decreases the current
  • C. It has no effect
  • D. It stops the current
Q. What is the effect of increasing the work function of a metal on the photoelectric effect?
  • A. More electrons are emitted
  • B. Fewer electrons are emitted
  • C. The frequency of light must be increased
  • D. Both B and C are correct
Q. What is the electron configuration of the element with atomic number 26?
  • A. 1s2 2s2 2p6 3s2 3p6 4s2 3d6
  • B. 1s2 2s2 2p6 3s2 3p6 4s2 3d5
  • C. 1s2 2s2 2p6 3s2 3p6 4s2 3d7
  • D. 1s2 2s2 2p6 3s2 3p6 4s2 3d8
Q. What is the energy band gap of silicon at room temperature?
  • A. 0.1 eV
  • B. 1.1 eV
  • C. 1.5 eV
  • D. 2.0 eV
Q. What is the energy difference between the n=1 and n=2 levels in a hydrogen atom?
  • A. 10.2 eV
  • B. 13.6 eV
  • C. 1.89 eV
  • D. 3.4 eV
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