Draw and label a simple diagram of the following:
a. a refracting telescope
b. a reflecting telescope
What will be an ideal response?
Diagrams should look similar to Figures 5.14a and 5.15b in the text.
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Which of the following is true of double-lobed radio sources?
A) Their radio lobes are associated with interacting galaxies. B) They are less active than normal galaxies. C) Their nuclei are relatively cooler than their peripheries. D) Their radio lobes are located at the end of their spiral arms.
The ozone layer lies in the mesosphere
Indicate whether the statement is true or false
The very first stars in the universe were made of
A) hydrogen and helium. B) hydrogen and helium, 10% heavy elements. C) hydrogen and helium, 0.1% heavy elements. D) hydrogen and helium, 2% heavy elements.
An electromagnetic wave has a peak electric field of 3.0 kV/m. What is the intensity of the wave? (c = 3.0 × 108 m/s, ?0 = 4? × 10-7 T • m/A, ?0 = 8.85 × 10-12 C2/N • m2)
A) 24 kW/m2 B) 12 kW/m2 C) 8.0 kW/m2 D) 4.0 kW/m2