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# Physics Modern Quiz

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Light can be characterized as a
A. wave
B. particle
C. both A and B
D. none of the above
C
E = hf, suggest that energy of a photon and frequency are
A. directly proportional
B. inverse square relationship
C. have no relationship
D. inversely proportional
A
When high-frequency light shines on certain metals electrons are emitted. This phenomenon is known as the
A. Doppler Effect
B. Photon Effect
C. Photoelectric Effect
D. Heisenberg Effect
C
The photoelectric effect would suggest light is a
A. particle
B. wave
C. both wave and particle
D. neither a wave or a particle
A
A student notices that red light does not activate a photocell, but blue light will activate the photocell. What is the most likely explanation?
A. red light has a higher frequency and therefore greater energy
B. red light has a higher frequency and therefore less energy
C. blue light has a higher frequency and therefore greater energy
D. blue light has a higher frequency and therefore less energy
C
Which of the following photons would have the least energy?
A. ultraviolet light
B. red light
C. green light
D. blue light
B
The ratio of a photon's energy to its frequency is known as what quality? Plank's constant h is the ratio of
A. Energy and wavelength
B. Energy and frequency
C. wavelength and frequency
D. speed and wavelength
B
Einstein's equation E = mc^2 suggest
A. Energy times the speed of light squared is equal to mass
B. mass and energy are not related
C. the ratio of Energy and mass is equal to the speed of light
D. mass traveling at the speed of light squared is energy
D
Two photons have the same frequency. They also have the same
A. energy
B. wavelength
C. both A and B
D. none of the above
C
A picture shows a particle or ray going through a hand and aluminum, but being stopped by a piece of thick lead. This can occur for what type of radioactive particle or ray?
A. gamma ray
B. beta particle
C. alpha particle
D. all of the above
A
A picture shows a particle or ray being stopped by a hand. This can occur for what type of radioactive particle or ray?
A. gamma ray
B. beta particle
C. alpha particle
D. all of the above
C
Using Einstein's mass-energy equivalence, how much energy is equivalent to a 2-kg mass?
A. 1.7 x 10^-8 J
B. 5.6 x 10^-17 J
C. 1.8 x 10^17 J
D. 1.5 x 10^9 J
C
The atomic bomb dropped on Hiroshima released 63 x 10^12 J energy, how much mass was converted to energy?
A. 7 x 10^-2 kg
B. 7 kg
C. 700 kg
D. 7 x 10^-4 kg
D
Object A and object B are traveling at the speed of light. If object A is more massive than object B, which object will have the greatest energy?
A. not enough information
B. they both have the same energy
C. Object A
D. Object B
C
What sub-atomic particle hits a Uranium 235 atom to cause it to split and produce a change reaction?
A. proton
B. photon
C. electron
D. neutron
D
What causes the release of large amounts of energy in a fission reaction?
A. the fission products have the same mass as the original atom
B. released neutrons emit large amounts of energy
C. the fission products have less mass than the original atom
D. the fission products have more mass than the original atom
C
Why are control rods used in a nuclear reactor?
A. They release excess neutrons
B. They release excess protons
C. They absorb excess neutrons
D. They absorb excess protons
C
How is nuclear fission used?
A. nuclear power plants
B. automobiles
C. internet connections
D. jet planes
A
The sun releases large amounts of energy by combining four hydrogen atomic nuclei into one Helium nucleus. This process is an example of
A. Nuclear fission
B. photoelectric effect
D. Nuclear fusion
D
What has taken place when an atom emits radiation, loses some mass and the nucleus becomes more stable?
A. Photoelectric effect
C. Chain reaction
D. Nuclear fusion
B
What is injected in the human body in order for a nuclear medicine scan to take pictures of tissues and organs?
A. magnetic fluid
C. nano-tubes
D. flu shot
B
According to Einstein's Theory of Relativity, what happens to all biological and mechanical clocks near the speed of light?
A. the clocks speed up
B. the clocks speed up and then slow down
C. the clocks slow down
D. nothing, time is constant
C
Four hydrogen atoms in the sun fuse to form one helium atom. This process releases energy as heat and light. Compared to the mass of the four hydrogen atoms, the mass of the helium will be ___ because ____.
A. less; some mass is converted to energy
B. unknown; alchemy does not exist
C. equal; mass is always conserved
D. greater; the extra mass is produced in the reaction
A
An ______ _________ occurs when light passes through a cold, dilute gas and atoms in the gas absorb at characteristic frequencies
A. absorption spectrum
B. composition spectrum
C. emission spectrum
D. continuous spectrum
A
The unique wavelengths of light that a substance emits is known as a _______ ________
A. spectral profile
B. emission spectrum
C. continuous spectrum
D. absorption spectrum
B
Which of the following statements correctly compares the energies of red light (4.8 x 10^14 Hz) and green light (5.9 x 10^14 Hz)?

COLOR/FREQUENCY RANGES
Violet (6.3 x 10^14 Hz - 7.4 x 10^14 Hz)
Blue (5.9 x 10^14 Hz - 6.3 x 10^14 Hz)
Green (5.5 x 10^14 Hz - 5.9 x 10^14 Hz)
Yellow (5.1 x 10^14 Hz - 5.3 x 10^14 Hz)
Orange (4.8 x 10^14 Hz - 5.1 x 10^14 Hz)
Red (4.1 x 10^14 Hz - 4.8 x 10^14 Hz)

A. The energy of green light is 1.5 x 10^-7 J more than the energy of red light
B. The energy of green light is 7.29 x 10^-20 J more than the energy of red light
C. The energy of red light is 7.29 x 10^-20 J more than the energy of red light
D. The energies of both the red and green lights are the same as both of these lights are in the visible region
B
Which color light needs to be used if an energy of 3.98 x 10^-19 J of energy is needed to remove an electron from a neutral metal atom?

COLOR/FREQUENCY RANGES
Violet (6.3 x 10^14 Hz - 7.4 x 10^14 Hz)
Blue (5.9 x 10^14 Hz - 6.3 x 10^14 Hz)
Green (5.5 x 10^14 Hz - 5.9 x 10^14 Hz)
Yellow (5.1 x 10^14 Hz - 5.3 x 10^14 Hz)
Orange (4.8 x 10^14 Hz - 5.1 x 10^14 Hz)
Red (4.1 x 10^14 Hz - 4.8 x 10^14 Hz)

A. Violet
B. Yellow
C. Blue
D. Red
C
What is the energy of a 3.12 x 10^14 Hz wave?
A. 3.07 x 10^-19 J
B. 1.27 x 10^-19 J
C. 5.07 x 10^-19 J
D. 2.07 x 10^-19 J
D
What is the frequency of a wave carrying 6.35 x 10^-18 J of energy?
A. 1.26 x 10^-34 Hz
B. 9.57 x 10^-34 Hz
C. 1.26 x 10^16 Hz
D. 9.57 x 10^15 Hz
D
If the frequency of a wave is tripled, which of the following is true about the energy of the wave?
A. Energy of the wave quadruples as the energy of the wave is directly proportional to the frequency of the wave
B. Energy of the wave also triples as the energy of the wave is directly proportional to the frequency of the wave
C. Energy of the wave becomes one third the original value as the frequency of the wave is inversely proportional to the energy of the wave
D. Energy of the wave remains the same as energy and frequency of the wave are unrelated
B