What is a "pulsating star"?
A. a star whose mass changes as it comes into contact with another star
B. a rotating neutron star that emits radio waves in a narrow beam
C. a star whose luminosity changes as it regularly expands and contracts
D. a planetary nebula
Answer: C
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A 100-W resistance heater is connected to a 110-V dc source. What is the current through the heater?
A) 1.1 A B) 2.2 A C) 3.3 A D) 4.4 A E) 0.91 A
What is the absolute pressure at a distance 5.00 m below the surface of a lake? Assume the density of the water in the lake is 1000 kg/m3
A) 5.00 × 103 N/m2 B) 1.50 × 105 N/m2 C) 0.49 × 105 N/m2 D) 1.05 × 105 N/m2 E) 4.66 × 105 N/m2
What is a CCD, and how does it work? Why is it replacing film?
What will be an ideal response?
According to the de Broglie hypothesis, which of the following statements is applicable to the wavelength of a moving particle?
a. directly proportional to its momentum b. inversely proportional to its energy c. inversely proportional to its momentum d. directly proportional to its energy