If absorption lines of sodium are not present in a star's spectrum, the star must not contain any sodium
a. True
b. False
Indicate whether the statement is true or false
False
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Knowing that the dot near the upper center of the Sun in this photo is the planet Venus, you can conclude that the photo was taken
A) during a transit. B) when Venus is at greatest western elongation. C) when Venus is at greatest eastern elongation. D) when Venus is at superior conjunction.
When an object is placed 118 cm from a thin concave lens, its image is found to be 59 cm from the lens. The lens is removed, and replaced by a thin convex lens whose focal length has the same magnitude as the diverging lens
This second lens is at the original position of the first lens. Where is the image of the object now?
The moons of Mars, Phobos (Fear) and Deimos (Terror), are very close to the planet compared to Earth's Moon. Their orbital radii are 9,378 km and 23,459 km respectively
What is the ratio of the orbital speed of Phobos to that of Deimos? A) 1.582 B) 0.2528 C) 3.956 D) 2.858 E) 0.3998
Answer the following statement(s) true (T) or false (F)
1. Equation E18.4 
is also solved by a function f (s), where s = t + x/c.
2. One can in principle create a purely electric traveling electromagnetic wave in empty space 