Which of the following is true of the Sun?
A) It is a nonluminous body.
B) It generates energy by nuclear fission reactions.
C) It is about 100 times larger in diameter than Earth.
D) It shines by reflecting light from Venus.
C
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Typically, what color is the Martian sky during in the morning and evenings?
A) green B) yellow-brown C) red D) blue
Briefly explain why white-dwarf supernovae are useful for measuring cosmic distances
What will be an ideal response?
A plastic block of dimensions 2.00 cm × 3.00 cm × 4.00 cm has a mass of 30.0 g. What is its density?
A) 0.80 g/cm3 B) 1.20 g/cm3 C) 1.25 g/cm3 D) 1.60 g/cm3
An electron moving along the +x-axis enters a magnetic field. If the electron experiences a magnetic deflection in the -y direction, then the magnetic field must have a component
A) along the +y-axis B) along the -x-axis C) along the -z-axis D) along the +z-axis E) along the -y-axis