A radioactive nuclide of atomic number Z emits an alpha particle and the daughter nucleus then emits a beta particle. What is the atomic number of the resulting nuclide?
A) Z-1
B) Z+1
C) Z-2
D) Z-3
A
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A bulb is designed for 100 W at 130 V rms. What is the power dissipated by this bulb if it is used in a 120 V rms circuit?
A. 169 W B. 130 W C. 100 W D. 85.0 W E. it will blow out
Intensity: The average intensity of sunlight impinging on Earth is measured to be about 1.4 kW/m2. What is the power of sunlight emitted by the sun? (Earth-Sun distance = 1.5 × 108 km, Earth radius = 6.4 × 103 km)
A. 4.0 × 1026 W B. 3.2 × 1022 W C. 7.2 × 1014 W D. 7.6 × 108 W
Radiation darkening explains why
A) there are so many dark craters on the jovian moons. B) Uranus' moons are darker than Saturn's. C) Earth's Moon is made of rock, but jovian moons are icy. D) Iapetus has a two-faced appearance.
Suppose NASA wants a satellite to revolve around Earth 5 times a day. What should be the radius of its orbit if we neglect the presence of the Moon? (G = 6.67 × 10-11 N ? m2/kg2, Mearth = 5.97 × 1024 kg)
A) 1.44 × 107 m B) 0.69 × 107 m C) 7.22 × 107 m D) 2.11 × 107 m