An organ pipe is 60.0 cm long and is open at one end and closed at the other. The frequency of the third mode is 300 Hz higher than the frequency of the second mode. What is the velocity of sound?
A. 280 m/s
B. 300 m/s
C. 320 m/s
D. 340 m/s
E. 360 m/s
E. 360 m/s
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A collection of atoms has 20% of the sample in a state above the ground state. If these emit coherent radiation, what is the wavelength of the laser light produced? (c = 3.00 × 108 m/s, h = 6.626 × 10-34 J ? s, 1 eV = 1.60 × 10-19 J)
A) 210 nm B) 91 nm C) 340 nm D) 34 nm
Two lenses, the first with focal length 10.0 cm and the second with focal length -12.5 cm, are separated by 20.0 cm. An object, 2.40 cm tall, is 15.0 cm in front of the first lens. Which of the following characteristics does the final image have?
A. real and upright B. real and inverted C. virtual and upright D. virtual and inverted E. virtual and diminished in size
Which of the identical light bulb(s) is(are) brightest when the capacitor has half its maximum charge?
a.
A
b.
B
c.
C
d.
A and B
e.
All three are equally bright.
Giant and supergiant stars are rare because that stage of stellar evolution is short
Indicate whether the statement is true or false