A charged particle moves into a region containing both an electric field and a magnetic field. Which of the statements below is/are true?
A. The particle cannot accelerate in the direction of B.
B. The path of the particle must be a circle.
C. Any change in the particle's kinetic energy is caused by the E field.
1.Only A
2.Only B
3.Only C
4.Both A and B
5.Both A and C
6.Both B and C
7.All are true.
8.None are true.
3
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Which of the following best describes the axes of a Hertzsprung-Russell (H-R) diagram?
A) mass on the horizontal axis and luminosity on the vertical axis B) surface temperature on the horizontal axis and luminosity on the vertical axis C) mass on the horizontal axis and stellar age on the vertical axis D) interior temperature on the horizontal axis and mass on the vertical axis E) surface temperature on the horizontal axis and radius on the vertical axis
Why is Neptune denser than Saturn?
A) Neptune has a higher proportion of hydrogen compounds and rocks than Saturn. B) Neptune has a larger mass and stronger gravity than Saturn. C) Neptune has a much more massive core than Saturn. D) Neptune has a greater proportion of helium compared to hydrogen than Saturn.
The orbits of all the planets of the Solar System are inclined _____ to each other
A) less than 2 degrees B) more than 10 degrees C) less than 8 degrees D) more than 12 degrees
Astronomers believe that the massive object at the center of the Milky Way is a black hole because
A. it is necessary to explain the Galaxy's rotation curve. B. images show an accretion disk surrounding an empty spot. C. gravitational wave measurements indicate a black hole is there. D. observations at X-ray waves, infrared waves, and radio waves limit the size of the object to smaller than 10 AU.