The closest star to the Sun is named ______________.
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[Ques. 2] Bohr's revolutionary step in his theory was to ______________ the angular momentum of the electron.
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[Ques. 3] A 500-turn circular loop 15.0 cm in diameter is initially aligned so that its axis is parallel to the Earth's magnetic field. In 2.77 ms the coil is flipped so that its axis is perpendicular to the Earth's field. If a voltage of 0.166 V is induced in the coil, what is the value of the Earth's magnetic field?
[Ques. 4] A star of magnitude 1 appears ______________ times brighter than a star of magnitude 2.
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[Ques. 5] Dispersing light from a hot, low-pressure gas gives a spectrum of the type known as (two words) ______________ ______________.
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[Ques. 6] A rectangular coil of 100 turns measures 40.0 cm by 20.0 cm. This coil is placed next to an electromagnet which is switched on, increasing the magnetic field through the coil from zero to 0.800 T in 50.0 ms. If the resistance of the coil is 2.0 ohms, what are the induced voltage and current in the coil?
[Ques. 7] In a star, the condition of balance between the inward force of gravity and the outward force of thermal and radiation pressure is known as ______________ equilibrium.
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[Ques. 8] The n = 2 energy level is known as the (two words) ______________ ______________ state.
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[Ques. 9] In a demonstration, a 4.00 cm2 square coil with 10000 turns enters a larger square region with a uniform 1.50 T magnetic field at a speed of 100 m/s. The plane of the coil is perpendicular to the field lines. If the breakdown voltage of air is 4000 V/cm on that day, the largest gap you can have between the two wires connected to the ends of the coil and still get a spark is
a. 7.5 103 cm.
b. 0.015 cm.
c. 7.5 cm.
d. 13 cm.
e. 15 cm.
[Ques. 10] One ______________ is defined as the distance to a star when the star exhibits a parallax of one second of arc.
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