What do we mean when we say that a nucleus undergoes radioactive decay?
a. The mass of the nucleus is converted into high-energy X rays and gamma rays.
b. The nucleus splits into two equal size pieces.
c. The nucleus emits radio waves.
d. The number of protons or neutrons (or both) in the nucleus changes.
Ans: d. The number of protons or neutrons (or both) in the nucleus changes.
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A) Hubble's law. B) Leavitt's law. C) the inverse square law for light. D) Kepler's third law.
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Gamma rays are photons with very high energy. How many visible-light photons with a wavelength of 500 nm would you need to equal the energy of a gamma-ray photon with energy
A) 1.0 × 106 B) 1.4 × 108 C) 6.2 × 109 D) 3.9 × 103
A damped harmonic oscillator, with a damping force proportional to its speed, is oscillating with an amplitude of 0.500 cm at t = 0
When t = 8.20 s, the amplitude has died down to 0.400 cm. At what value of t will the oscillations have an amplitude of 0.250 cm? A) 18.5 s B) 20.5 s C) 16.5 s D) 25.5 s E) 5.13 s