Which statement about antimatter is not true?
A) An antielectron (positron) is identical to an ordinary electron except it has a positive charge.
B) Every ordinary particle has a corresponding antiparticle.
C) When a particle and its antiparticle meet, the result is mutual annihilation that turns all of the mass into energy.
D) Antimatter has been hypothesized to exist but has never actually been detected.
D
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Energy Levels: A hydrogen atom is excited to the n = 9 level. Its decay to the n = 6 level detected in a photographic plate. What is the frequency of the light photographed? (1 eV = 1.60 × 10-19 J, h = 6.626 × 10-34 J ? s)
A. 5.08 × 1013 Hz B. 5910 Hz C. 5910 nm D. 3.28 × 10-9 km
What man-made object exceeded the speed of sound long before the invention of the airplane or the bullet?
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Which sugar is found in greater than normal amounts in the blood of a diabetic?
a. Sucrose b. Lactose c. Glucose d. Fructose
A 20.0-mH inductor is connected in series with a 100-? resistor at 1.00 kHz in an ac circuit. What is the phase angle of this circuit?
A) 51.5° B) 90.0° C) 45° D) 0° E) 38.5°