Modern Physics

Q. What is the relationship between the stopping potential and the maximum kinetic energy of the emitted electrons in the photoelectric effect?
  • A. Stopping potential is directly proportional to the work function
  • B. Stopping potential is inversely proportional to the maximum kinetic energy
  • C. Stopping potential is equal to the maximum kinetic energy
  • D. Stopping potential has no relation to the photoelectric effect
Q. What is the relationship between the stopping potential and the maximum kinetic energy of emitted electrons in the photoelectric effect?
  • A. Stopping potential is directly proportional to the work function
  • B. Stopping potential is directly proportional to the maximum kinetic energy
  • C. Stopping potential is inversely proportional to the frequency
  • D. Stopping potential has no relation to kinetic energy
Q. What is the relationship between the wavelength of light and the energy of the emitted electrons in the photoelectric effect?
  • A. Energy is directly proportional to wavelength
  • B. Energy is inversely proportional to wavelength
  • C. Energy is independent of wavelength
  • D. Energy is proportional to the square of wavelength
Q. What is the relationship between the work function and the threshold frequency?
  • A. Φ = hν₀
  • B. Φ = ν₀/h
  • C. Φ = h/ν₀
  • D. Φ = ν₀²/h
Q. What is the role of a demodulator in a communication system?
  • A. To amplify the received signal
  • B. To convert the modulated signal back to its original form
  • C. To filter out noise from the signal
  • D. To encode the signal for transmission
Q. What is the role of a diode in a circuit?
  • A. Resistor
  • B. Capacitor
  • C. Current regulator
  • D. Current rectifier
Q. What is the role of a diode in a semiconductor circuit?
  • A. Amplification
  • B. Rectification
  • C. Oscillation
  • D. Capacitance
Q. What is the role of a moderator in a nuclear reactor?
  • A. To absorb neutrons
  • B. To slow down neutrons
  • C. To increase the temperature
  • D. To shield radiation
Q. What is the role of a p-n junction in a semiconductor device?
  • A. To increase resistance
  • B. To create a depletion region
  • C. To enhance thermal conductivity
  • D. To reduce current flow
Q. What is the role of a semiconductor in a transistor?
  • A. To store charge
  • B. To amplify current
  • C. To insulate
  • D. To generate heat
Q. What is the role of a transistor in electronic circuits?
  • A. Switching
  • B. Amplification
  • C. Signal modulation
  • D. All of the above
Q. What is the role of a transponder in satellite communication?
  • A. To amplify the received signal
  • B. To convert signals from one frequency to another
  • C. To modulate the signal for transmission
  • D. To demodulate the received signal
Q. What is the role of temperature in the behavior of semiconductors?
  • A. It has no effect
  • B. It decreases conductivity
  • C. It increases the number of charge carriers
  • D. It only affects p-type semiconductors
Q. What is the significance of the Heisenberg Uncertainty Principle in atomic structure?
  • A. It defines the size of the nucleus
  • B. It limits the precision of measuring position and momentum
  • C. It explains electron configurations
  • D. It describes the stability of atoms
Q. What is the significance of the Heisenberg Uncertainty Principle?
  • A. It defines the energy levels of electrons
  • B. It states that position and momentum cannot be simultaneously known
  • C. It describes the behavior of light
  • D. It explains the stability of atomic nuclei
Q. What is the significance of the photoelectric effect in modern physics?
  • A. It explains the wave nature of light
  • B. It supports the theory of relativity
  • C. It led to the development of quantum mechanics
  • D. It has no significance
Q. What is the term for the energy required to remove an electron from an atom in the gas phase?
  • A. Ionization energy
  • B. Electron affinity
  • C. Electronegativity
  • D. Electrostatic energy
Q. What is the threshold frequency for a metal if the work function is 4.5 eV?
  • A. 5.4 x 10^14 Hz
  • B. 6.0 x 10^14 Hz
  • C. 7.2 x 10^14 Hz
  • D. 8.0 x 10^14 Hz
Q. What is the total number of orbitals in the n=2 energy level?
  • A. 2
  • B. 4
  • C. 6
  • D. 8
Q. What is the total number of orbitals in the n=4 energy level?
  • A. 4
  • B. 8
  • C. 16
  • D. 32
Q. What is the truth value of the expression A AND (B OR C) when A = 1, B = 0, and C = 1?
  • A. 0
  • B. 1
  • C. 2
  • D. 3
Q. What is the truth value of the expression A AND (B OR C) when A = 1, B = 0, C = 1?
  • A. 0
  • B. 1
  • C. 2
  • D. Undefined
Q. What is the typical band gap of germanium?
  • A. 0.66 eV
  • B. 1.1 eV
  • C. 1.5 eV
  • D. 2.0 eV
Q. What is the typical range of energy band gaps for semiconductors?
  • A. 0.1 - 0.5 eV
  • B. 0.5 - 1.5 eV
  • C. 1.5 - 3.0 eV
  • D. 3.0 - 5.0 eV
Q. What is the typical range of the energy band gap for semiconductors?
  • A. 0.1 - 0.5 eV
  • B. 0.5 - 2.5 eV
  • C. 2.5 - 5 eV
  • D. 5 - 10 eV
Q. What is the uncertainty in position if the uncertainty in momentum of a particle is 1.0 x 10^-24 kg m/s?
  • A. 1.0 x 10^-10 m
  • B. 6.63 x 10^-10 m
  • C. 1.0 x 10^-34 m
  • D. 6.63 x 10^-34 m
Q. What is the uncertainty principle formulated by Heisenberg?
  • A. ΔxΔp ≥ ħ/2
  • B. ΔEΔt ≥ ħ
  • C. ΔxΔE ≥ ħ
  • D. ΔpΔt ≥ ħ
Q. What is the uncertainty principle in quantum mechanics?
  • A. ΔxΔp ≥ ħ/2
  • B. ΔEΔt ≥ ħ/2
  • C. Both A and B
  • D. None of the above
Q. What is the wavelength of an electron accelerated through a potential difference of 100 V? (mass of electron = 9.11 x 10^-31 kg)
  • A. 1.22 x 10^-10 m
  • B. 1.23 x 10^-9 m
  • C. 1.24 x 10^-11 m
  • D. 1.25 x 10^-12 m
Q. What is the wavelength of light emitted when an electron transitions from n=3 to n=2 in a hydrogen atom?
  • A. 410 nm
  • B. 656 nm
  • C. 486 nm
  • D. 434 nm
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