Briefly explain how antimatter can be produced by scientists
What will be an ideal response?
Antimatter is produced in particle accelerators. When particles collide and release large amounts of energy in one place, some of the energy spontaneously turns into mass. This mass must contain particles and their antiparticles in equal quantities.
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What did Carl Sagan mean when he said that we are all "star stuff"?
A) that life would be impossible without energy from the Sun B) that the Earth formed at the same time as the Sun C) that the carbon, oxygen, and other elements essential to life were created by fusion in stellar cores D) that the Sun formed from the interstellar medium: the "stuff" between the stars E) that the universe contains billions of stars
Which of the following is not evidence for dark matter?
A) the flat rotation curves of spiral galaxies B) x-ray observations of hot gas in galaxy clusters C) gravitational lensing around galaxy clusters D) the expansion of the universe
The simplest member of the aromatic hydrocarbons is named ______________
Fill in the blank(s) with correct word
An optical fiber is made with core material of index of refraction 1.6 . The fiber is clad with a material of index 1.2 . What is the speed of light traveling along the central axis of this fiber?
a. 2.5 × 10^8 m/s c. 2.0 × 10^8 m/s b. 1.9 × 10^8 m/s d. 3.0 × 10^8 m/s