Physics 1260 Exam 4 Latest Update 2025-2026
Questions and 100% Verified Correct Answers
Guaranteed A+
A certain radioactive isotope placed near a Geiger counter registers 120 counts per
minute (cpm). If the half-life of the isotope is one day, what will be the count rate at the
end of four days?
A) 30 cpm
B) 15 cpm
C) 10 cpm
D) 7.5 cpm
E) 5 cpm - CORRECTANSWER: D) 7.5 cpm
A spaceship whizzes past a planet at high speed. An observer on the planet sees a
contracted spaceship, while an observer on the spaceship sees
A) a contracted planet
B) an expanded planet
C) a normal planet
D) a contracted or expanded planet depending on the direction of travel -
CORRECTANSWER: A) a contracted planet
According to Einstein's theory of special relativity
A) space and time are aspects of each other
B) energy and mass are aspects of each other
C) [both of these]
D) [neither of these] - CORRECTANSWER: C) [both of these]
According to Einstein's theory of special relativity
, A) space and time are aspects of each other
B) energy and mass are aspects of each other
C) both of these
D) neither of these - CORRECTANSWER: C) both of these
According to Louis de Broglie, a material particle has
A) particle properties
B) wave properties
C) [both of these]
D) [neither of these] - CORRECTANSWER: C) [both of these]
According to the special theory of relativity, while traveling at very high speed your pulse
rate
A) increases
B) decreases
C) remains unchanged - CORRECTANSWER: C) remains unchanged
According to the well-known equation E = mc2,
A) mass and energy travel at the speed of light squared
B) energy is actually mass traveling at the speed of light squared
C) mass and energy travel at twice the speed of light
D) mass and energy are related
E) none of these - CORRECTANSWER: D) mass and energy are related
After passing through double slits, electrons make a pattern on a screen that
A) shows which slit each electron has passed through
B) resembles a pattern that waves make
Questions and 100% Verified Correct Answers
Guaranteed A+
A certain radioactive isotope placed near a Geiger counter registers 120 counts per
minute (cpm). If the half-life of the isotope is one day, what will be the count rate at the
end of four days?
A) 30 cpm
B) 15 cpm
C) 10 cpm
D) 7.5 cpm
E) 5 cpm - CORRECTANSWER: D) 7.5 cpm
A spaceship whizzes past a planet at high speed. An observer on the planet sees a
contracted spaceship, while an observer on the spaceship sees
A) a contracted planet
B) an expanded planet
C) a normal planet
D) a contracted or expanded planet depending on the direction of travel -
CORRECTANSWER: A) a contracted planet
According to Einstein's theory of special relativity
A) space and time are aspects of each other
B) energy and mass are aspects of each other
C) [both of these]
D) [neither of these] - CORRECTANSWER: C) [both of these]
According to Einstein's theory of special relativity
, A) space and time are aspects of each other
B) energy and mass are aspects of each other
C) both of these
D) neither of these - CORRECTANSWER: C) both of these
According to Louis de Broglie, a material particle has
A) particle properties
B) wave properties
C) [both of these]
D) [neither of these] - CORRECTANSWER: C) [both of these]
According to the special theory of relativity, while traveling at very high speed your pulse
rate
A) increases
B) decreases
C) remains unchanged - CORRECTANSWER: C) remains unchanged
According to the well-known equation E = mc2,
A) mass and energy travel at the speed of light squared
B) energy is actually mass traveling at the speed of light squared
C) mass and energy travel at twice the speed of light
D) mass and energy are related
E) none of these - CORRECTANSWER: D) mass and energy are related
After passing through double slits, electrons make a pattern on a screen that
A) shows which slit each electron has passed through
B) resembles a pattern that waves make
