Fraunhofer was the German astronomer who first noted ________ lines in the Sun's spectrum
Fill in the blank(s) with correct word
absorption
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Why is a complete image formed even if half of a lens or mirror is blocked?
What will be an ideal response?
What mechanism explains the presence of "hot Jupiters" around many other stars?
A) evaporation of the disk by the stellar wind removes gas that was holding the planet at a large radius B) gravitational attraction by terrestrial planets that formed at small radii attract the giant planets inward C) rapid formation of the gas giant from evaporated rock and metal at the inner disk edge D) planetary migration caused by gravitational interactions between the planet and disk
A charged particle moves in a region of uniform magnetic field along a helical path (radius = 4.0 cm, pitch = 20 cm, period = 2.0 ms). What is the speed of the particle as it moves along this path?
a. 0.13 km/s b. 0.10 km/s c. 0.16 km/s d. 0.23 km/s e. 0.06 km/s
What phase of the Moon must it be to have a lunar eclipse?
A. full moon B. first quarter C. new moon D. third quarter