Modern Physics

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Q. In nuclear fission, what is the primary product of the reaction?
  • A. Helium
  • B. Neutrons
  • C. Protons
  • D. Alpha particles
Q. In nuclear fission, what is the primary product?
  • A. Helium
  • B. Neutrons
  • C. Protons
  • D. Alpha particles
Q. In nuclear fission, what is typically released as a result of the reaction?
  • A. Energy and neutrons
  • B. Energy and protons
  • C. Neutrons and electrons
  • D. Protons and energy
Q. In nuclear fusion, what is typically required to overcome the repulsion between nuclei?
  • A. High temperature and pressure
  • B. Low temperature and pressure
  • C. Magnetic fields
  • D. Chemical reactions
Q. In nuclear reactions, what is the term for the energy required to remove a nucleon from the nucleus?
  • A. Ionization energy
  • B. Binding energy
  • C. Dissociation energy
  • D. Activation energy
Q. In the Bohr model of the hydrogen atom, what is the energy of the electron in the n=2 level?
  • A. -13.6 eV
  • B. -3.4 eV
  • C. -1.51 eV
  • D. 0 eV
Q. In the Bohr model of the hydrogen atom, what is the radius of the first orbit?
  • A. 0.0529 nm
  • B. 0.1 nm
  • C. 0.529 nm
  • D. 0.529 pm
Q. In the photoelectric effect, if the frequency of incident light is doubled, what happens to the kinetic energy of the emitted electrons?
  • A. It doubles
  • B. It quadruples
  • C. It remains the same
  • D. It becomes zero
Q. In the photoelectric effect, increasing the intensity of light increases the:
  • A. Kinetic energy of emitted electrons
  • B. Number of emitted electrons
  • C. Wavelength of emitted light
  • D. Work function
Q. In the photoelectric effect, the kinetic energy of the emitted electrons depends on which of the following?
  • A. Frequency of the incident light
  • B. Intensity of the incident light
  • C. Wavelength of the incident light
  • D. All of the above
Q. In the photoelectric effect, what does the term 'work function' refer to?
  • A. The energy of the incident photons
  • B. The energy required to remove an electron from the metal
  • C. The maximum kinetic energy of emitted electrons
  • D. The frequency of the incident light
Q. In the photoelectric effect, what does the work function represent?
  • A. The energy of the incident photons
  • B. The maximum kinetic energy of emitted electrons
  • C. The minimum energy required to remove an electron from the metal
  • D. The frequency of the incident light
Q. In the photoelectric effect, what happens to the emitted electrons if the frequency of the incident light is just at the threshold frequency?
  • A. They are emitted with maximum kinetic energy
  • B. They are emitted with zero kinetic energy
  • C. They are not emitted
  • D. They are emitted with negative kinetic energy
Q. In the photoelectric effect, what happens to the energy of the incident photon if it exceeds the work function?
  • A. All energy is used to emit electrons
  • B. Excess energy becomes kinetic energy
  • C. No electrons are emitted
  • D. Energy is lost as heat
Q. In the photoelectric effect, what happens to the kinetic energy of emitted electrons if the intensity of light is increased while keeping frequency constant?
  • A. Increases
  • B. Decreases
  • C. Remains the same
  • D. Becomes zero
Q. In the photoelectric effect, what happens to the kinetic energy of emitted electrons if the frequency of incident light is increased?
  • A. It decreases
  • B. It remains constant
  • C. It increases linearly with frequency
  • D. It increases with the square of frequency
Q. In the photoelectric effect, what happens to the kinetic energy of the emitted electrons if the frequency of the incident light is increased?
  • A. It decreases
  • B. It remains constant
  • C. It increases
  • D. It becomes negative
Q. In the photoelectric effect, what is the effect of increasing the frequency of incident light beyond the threshold frequency?
  • A. No effect on the emitted electrons
  • B. Increases the number of emitted electrons
  • C. Increases the kinetic energy of emitted electrons
  • D. Decreases the work function
Q. In the photoelectric effect, what is the effect of increasing the wavelength of incident light?
  • A. Increases the kinetic energy of emitted electrons
  • B. Decreases the kinetic energy of emitted electrons
  • C. Has no effect on the photoelectric effect
  • D. Increases the number of emitted electrons
Q. In the photoelectric effect, what is the relationship between the energy of the incident photon and the kinetic energy of the emitted electron?
  • A. K.E. = E_photon - Work function
  • B. K.E. = Work function - E_photon
  • C. K.E. = E_photon + Work function
  • D. K.E. = E_photon * Work function
Q. In the photoelectric effect, which of the following factors does NOT affect the photoelectric current?
  • A. Intensity of light
  • B. Frequency of light
  • C. Surface area of the metal
  • D. Type of metal
Q. What happens to the conductivity of a semiconductor as temperature increases?
  • A. Increases
  • B. Decreases
  • C. Remains constant
  • D. Becomes zero
Q. What happens to the Fermi level in a p-type semiconductor compared to an intrinsic semiconductor?
  • A. Moves up
  • B. Moves down
  • C. Remains the same
  • D. Becomes zero
Q. What happens to the kinetic energy of emitted electrons if the frequency of incident light is increased beyond the threshold frequency?
  • A. It decreases
  • B. It remains constant
  • C. It increases linearly with frequency
  • D. It becomes zero
Q. What happens to the number of emitted electrons if the intensity of light is increased while keeping the frequency above the threshold?
  • A. The number of emitted electrons decreases
  • B. The number of emitted electrons increases
  • C. The energy of each emitted electron increases
  • D. No electrons are emitted
Q. What happens to the number of emitted electrons if the intensity of the light is increased while keeping the frequency above the threshold?
  • A. The number of emitted electrons decreases
  • B. The number of emitted electrons increases
  • C. The energy of each emitted electron increases
  • D. No effect on the number of emitted electrons
Q. What happens to the photoelectric current if the voltage across the electrodes is increased?
  • A. Increases
  • B. Decreases
  • C. Remains constant
  • D. Becomes zero
Q. What happens to the photoelectric effect if the incident light is below the threshold frequency?
  • A. Electrons are emitted
  • B. No electrons are emitted
  • C. Electrons are emitted with low energy
  • D. Electrons are emitted with high energy
Q. What happens to the photoelectric effect if the metal surface is cooled?
  • A. More electrons are emitted
  • B. Fewer electrons are emitted
  • C. No effect on emission
  • D. Electrons are emitted with higher energy
Q. What is the approximate energy released in MeV during the fission of one uranium-235 nucleus?
  • A. 0.1 MeV
  • B. 1 MeV
  • C. 200 MeV
  • D. 1000 MeV
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