The type of elements present in a gas can be determined by studying the ____
a. number of ionized atoms in the gas
b. energy of the electrons being emitted by the gas
c. number of photons being absorbed or emitted by the gas
d. wavelengths of photons absorbed or emitted from the gas
e. number of excited atoms in the gas
d
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A certain factory whistle can be heard up to a distance of 9.8 km
Assuming that the acoustic output of the whistle is uniform in all directions, at what distance from the factory is the intensity level of the whistle sound equal to 25 dB? The threshold of human hearing is 1.0 × 10-12 W/m2. A) 550 m B) 660 m C) 830 m D) 940 m E) 1,100 m
Consider an ideal solenoid of length L, N windings, and radius b (L is much longer than b). A current I is flowing through the wire windings
If the radius of the solenoid is doubled to 2b, but all the other quantities remain the same, the magnetic field inside the solenoid will A) remain the same. B) become twice as strong as initially. C) become one-half as strong as initially. D) become four times as strong as initially. E) become one-fourth as strong as initially.
One star has a surface temperature of 6000 K and another has a surface temperature of 7000 K. If the two stars have the same absolute luminosity, which star has the largest radius?
A) the star at 6000 K B) the star at 7000 K C) The two stars have the same radius. D) Not enough information is given to determine.
The volume of a 10-mL test tube is equivalent to which one of the following quantities?
A) 0.01 L B) 0.001 kL C) 0.1 L D) 1 × 10-6 L E) 0.001 ML