The production of exotic ____ particle pairs in the core of a high-mass star has a significant effect on the fusion of heavy elements
a. electron-positron
b. electron-proton
c. proton-antiproton
d. neutrino-antineutrino
e. baryon-antibaryon
d
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How can an old pulsar have a very short pulsar period, say less than 0.03 seconds?
What will be an ideal response?
It takes ________ astronauts to operate the Hubble Space Telescope
Fill in the blank(s) with correct word
A crystal diffracted a beam of electrons. The crystal spacing was 0.18 nm and the maximum scattering occurred at 80.° relative to the surface normal. The electrons were directed normally onto the crystal
(a) What is the wavelength of the electrons? (b) What potential difference accelerated the electrons?
You throw a ball up in the air and hold your hand under it to catch it when it comes down. The reason why the ball stops is because
a. your hand is there: your hand exerts no force on the ball. b. your hand exerts a force on the ball perpendicular to its velocity. c. your hand exerts a force on the ball in the direction of its velocity. d. your hand exerts a force on the ball in the direction opposite to its velocity. e. your hand and the ball exert forces in the same direction on each other.