Which of the following statements about the Sun is an inference from a model, not an observation?
A) The photosphere emits visible light.
B) The Sun emits neutrinos.
C) The corona is hotter than the photosphere.
D) The convection zone is cooler than the radiation zone.
D) The convection zone is cooler than the radiation zone.
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The curved surface of a 50. cm focal length "plano-convex" lens has a radius of curvature of 30. cm. What is the refractive index of the glass?
What will be an ideal response?
Time Dilation: At age 21, you set out for a star that is 50 light-years from Earth. How fast would your spaceship have to travel in order to reach that star when you are 61 years old? One light-year is the distance light travels in one year.
A. 0.58c B. 0.68c C. 0.78c D. 0.88c E. 0.96c
A photon whose wavelength is = 5.0 × 10^?11 m is scattered straight backward. What is the wavelength of the scattered wave?
a. 5.0 × 10^?11 m b. 4.5 × 10^?11 m c. 5.5 × 10^?11 m d. 6.0 × 10^?11 m e. 6.5 × 10^?11 m
Silica has a relatively
A) low melting point. B) high melting point.