Which of following statements about the image formed by a single converging lens are true? (There could be more than one correct choice.)
A) The image is always real.
B) The image is always virtual.
C) The image is always inverted.
D) The image is always upright.
E) None of the above choices are correct.
E
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A lunar eclipse can only occur during the full phase
Indicate whether the statement is true or false
After an elastic collision of two balls, the kinetic energies of the two balls are measured to be 12J and 24J. What can be said about the kinetic energy of the two balls before the collision?
a. nothing—not enough information is given b. the balls had the same energies, 12J and 24J respectively c. the total kinetic energy of the two balls was 36J d. none of the above
Helium fusion does not begin until the star has entered the giant region of the H-R diagram
a. True b. False Indicate whether the statement is true or false
Why is Venus so much hotter than the Earth?
A) because it has much more carbon dioxide in its atmosphere B) because it rotates backwards compared to its orbital rotation C) because its clouds have a very high re?ectivity D) because it is closer to the Sun