Modern Physics

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 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 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 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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