What is the antimatter problem in pair production?
What will be an ideal response?
Where did the antiparticles go? If as many anti-neutrons were created as neutrons, and they were all annihilated, why are there any normal neutrons around today to build atomic nuclei?
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Kepler's Laws: Let the orbital radius of a planet be R and let the orbital period of the planet be T. What quantity is constant for all planets orbiting the sun, assuming circular orbits?
A. T/R B. T/R2 C. T2/R3 D. T3/R2 E. T2/R
The Doppler Effect is the apparent change in:
a) Speed b) Light c) Sound d) Frequency
If a spaceship travels near the speed of light away from the Earth, an observer on Earth would see the length of the spaceship ________
Fill in the blank(s) with correct word
A spaceship of mass m1 circles a planet (mass = m2) in an orbit of radius r. How much energy is required to transfer the spaceship to a circular orbit of radius 3R?
A. Gm1m2/(2r) B. ?Gm1m2/(3r) C. ?Gm1m2/(4r) D. ?Gm1m2/(6r) E. 3Gm1m2/(4r)