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?
- 30 cpm
- 15 cpm
- 10 cpm
- 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 contracted planet
- an expanded planet
- a normal planet
- a contracted or expanded planet depending on the direction of travel -
CORRECTANSWER: A) a contracted planet
According to Einstein's theory of special relativity
- space and time are aspects of each other
- energy and mass are aspects of each other
- [both of these]
D) [neither of these] - CORRECTANSWER: C) [both of these]
According to Einstein's theory of special relativity 1 / 2
- space and time are aspects of each other
- energy and mass are aspects of each other
- both of these
D) neither of these - CORRECTANSWER: C) both of these
According to Louis de Broglie, a material particle has
- particle properties
- wave properties
- [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
- increases
- decreases
C) remains unchanged - CORRECTANSWER: C) remains unchanged
According to the well-known equation E = mc2,
- mass and energy travel at the speed of light squared
- energy is actually mass traveling at the speed of light squared
- mass and energy travel at twice the speed of light
- 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
- shows which slit each electron has passed through
- resembles a pattern that waves make
- / 2