What is the speed of an electron in the n = 4 Bohr orbit of the hydrogen atom?
A) 5.47 × 105 m/s
B) 310 × 105 m/s
C) 1.39 × 105 m/s
D) 1.78 × 105 m/s
E) 2.18 × 106 m/s
A
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The temperature coefficient of resistivity of platinum is 3.9 × 10-3/K°. If a platinum wire has a resistance of R at room temperature (23.°C), to what temperature must it be heated in order to double its resistance to 2R?
What will be an ideal response?
How much money does it cost to leave on 10 60 watt lights for 15 hours, if the cost of electricity is 8 cents per kWh?
a. 15¢ b. 32¢ c. 72¢ d. 120¢ e. 480¢
Differential rotation is when a planet's equatorial and polar regions rotate at different rates
Indicate whether the statement is true or false
When a wire carries high current causing it to glow, it will emit which type of spectrum?
a. line emission b. line absorption c. continuous d. monochromatic