How far from a lens of focal length 50.0 mm must the object be placed if it is to form a virtual image magnified in size by a factor of three?
A) 33.3 mm
B) 48.0 mm
C) 38.3 mm
D) 42.2 mm
E) 54.4 mm
A
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If the diffusivity of radon gas into nitrogen gas at 20ºC, 1 atm pressure is 0.12 cm^2/s, what would you expect the diffusivity to be at 30ºC, 2 atm pressure?
What will be an ideal response?
An organ pipe is 80.0 cm long and is open at one end and closed at the other. The frequency of the third mode is 200 Hz higher than the frequency of the second mode. What is the velocity of sound?
A. 300 m/s B. 320 m/s C. 340 m/s D. 360 m/s E. 380 m/s
Determine the rms voltage drop across the capacitor in the circuit.
A. 55 V B. 77 V C. 110 V D. 154 V E. 198 V
Younger stars have more heavy elements because
a. old stars destroy heavy elements as they age. b. young stars burn their nuclear fuels faster. c. the heavy elements were made in previous generations of stars. d. heavy elements haven't had time to settle to the core of these younger stars. e. All of the other choices are correct.