21-cm radio waves allow us to map the distribution of hydrogen in spiral arms on the opposite side of the Galaxy
Indicate whether the statement is true or false
TRUE
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If you float a piece of wood in a container brim-full of water that rests on a weighing scale, some water will spill. Then the weight reading on the scale will
A) decrease. B) remain unchanged. C) increase.
Light enters a substance from air at an angle of 32.0°, and continues at an angle of 23.0°. What is the index of refraction of the substance?
A) 0.74 B) 1.11 C) 1.28 D) 1.36 E) 1.52
Bats can detect small objects such as insects that are of a size approximately that of one wavelength. If bats emit a chirp at a frequency of 50 kHz, and the speed of sound waves in air is 330 m/s, what is the smallest size insect they can detect?
a. 1.5 mm c. 5.5 mm b. 3.7 mm d. 6.6 mm
The observed distribution of matter in the Universe is best understood as being caused by ____
a. clumping of dark matter in the early Universe causing clumping of normal matter b. clumping of normal matter in the early Universe causing clumping of dark matter c. simultaneous clumping of normal and dark matter d. large variations in the intensity of the cosmic microwave background e. homogenous expansion of normal and dark matter