The total energy emitted by the brightest nova explosions is about:
A) 1,000 Suns.
B) 50,000 Suns.
C) a million Suns.
D) a billion Suns.
E) a trillion Suns.
C
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__________is a unit of distance equal to the distance light travels in 1 year
A) The astronomical year B) The light-year C) A light parsec D) A light meter
A 4.0-cm tall object is placed 60 cm in front of a converging lens of focal length of magnitude 30 cm. What are the nature and location of the image?
A) The image is real, 2.5 cm tall, 30 cm on the same side as object. B) The image is virtual, 2.0 cm tall, 15 cm on the other side of the lens. C) The image is real, 4.0 cm tall, 60 cm on the other side of the lens. D) The image is virtual, 4.0 cm tall, 60 cm on the same side as object. E) The image is virtual, 2.5 cm tall, 30 cm on the other side of the lens.
Which of the following is true of Venus?
A) Its atmosphere is transparent to visible light. B) Its atmosphere is transparent to infrared radiation. C) Its atmosphere is as dense as that of Earth. D) Its atmosphere is mostly composed of carbon dioxide.
The empty space surrounding text and images is called ______ space.
A. blank B. white C. void D. focal