Historical records show that there were very few sunspots from about 1645 to 1715, a phenomenon known as the _______________
Fill in the blank(s) with correct word
Maunder minimum
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A spaceship visits a star that is 4.5 light-years from Earth, and the spaceship travels at one-half the speed of light for the entire trip
(a) How long did the trip take according to an observer on Earth? (b) How long did the trip take according to an observer on the spaceship?
Thin Lenses: 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, 2.5 cm tall, 30 cm on the other side of the lens. C. The image is virtual, 2.0 cm tall, 15 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 real, 4.0 cm tall, 60 cm on the other side of the lens.
The present atmospheres of the terrestrial planets probably originated from their internal activity.
Answer the following statement true (T) or false (F)
The main form of radiation that our bodies emit is
a. ultraviolet. b. infrared. c. x-ray. d. microwave. e. blackbody.