The angular resolution of a telescope is never less than its diffraction limit
Indicate whether the statement is true or false
TRUE
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In the process of crystallization, the remaining magma becomes _______.
What will be an ideal response?
A conducting rod is sliding on metal rails with velocity v. A magnetic field B is into the paper, the separation of the rails is L, and the resistance of the circuit is R. In what direction in the diagram is the current flowing in the resistor?
A. up
B. down
C. up then down
D. down then up
E. Insufficient information given,
Which of the following statements about Kepler's laws is false?
A) Kepler's laws provide mathematical descriptions of the motion of the planets. B) Kepler's first law states that planetary orbits are shaped as ellipses. C) Kepler's second law implies that when planets are closer to the sun, they move faster. D) Kepler's laws explain why planets with larger semi-major axes have much longer orbital periods.
A 30.0 cm long organ pipe is filled with air and is open at one end and closed at the other. The velocity of sound in air at 0
is 331 m/s. What is the frequency of the second mode?
A. 900 Hz B. 827 Hz C. 750 Hz D. 721 Hz E. 650 Hz