PHYS Chapter 13

The end result of the CNO cycle is that four hydrogen nuclei become one helium nucleus

true

When iron fuses into heavier elements, it produces energy

false

Electrons and protons can combine to become neutrons

true

A supernova can be as bright as its entire host galaxy

true

A pulsar changes in brightness because its size pulsates

false

Place in order the stages of nuclear burning in evolving high-mass stars - helium - neon- oxygen- silicon - hydrogen- carbon

hydrogen, helium, carbon, neon, oxygen, silicon

An astronaut who fell into a black hole would be stretched because

the gravity changes dramatically over a short distance

Elements heavier than iron originate

Explosions of high-mass stars

X-ray binaries are similar to another type of system we have studies. This system is

progenitors of Type Ia supernovae

The fact that the speed of light is a universal constant forces us to completely rethink classical physics. This is an example of

the self-correcting nature of science

In a high--mass star, hydrogen fusion occurs via

the CNO cycle

The layers in a high-mass star occur roughly in order of

atomic number (also )fusion temperature

Pulsations in a Cepheid variable star are controlled by

the ionization state of helium

Eta Carinae is an extreme example of

massive star; high-temperature star

When photodisintegration starts in a star, a process begins that always results in a

supernova (Photodisintegration causes the core collapse of the star to accelerate, resulting in the explosion we see as a supernova.)

Supernova remnants

are viewable at all wavelengths

Marisol is standing in a small, windowless room. The force on her feet suddenly ceases. Which of the following conclusions can she draw?

Any of the above could be true (she is in an elevator, which is now accelerating downward, she is now in space, freely falling around Earth, or the rocket she was in has stopped accelerating upward)

If you could draw a very large circle in space near a black hole, its circumference

would be less than 2pi*r* \n

highly curved spacetime near a black hole, a circle will have a much smaller circumference than in Euclidean geometry

An object that passes near a black hole

is deflected by the curvature of space

Gravitational waves are an important confirmation of

general relativity