A Doppler weather radar operates at a frequency of 3.40 GHz. The wave from this radar system reflects from an approaching weather system moving with a speed of 39.0 m/s. What is the difference in frequency between the outgoing and returning waves?
A) 442 Hz
B) 351 Hz
C) 419 Hz
D) 322 Hz
E) 670 Hz
A
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A doubly charged ion (charge 2e) with velocity 6.9 × 106 m/s moves in a circular path of diameter 60.0 cm in a magnetic field of 0.80 T in a mass spectrometer. What is the mass of this ion? (e = 1.60 × 10-19 C)
A) 11 × 10-27 kg B) 6.7 × 10-27 kg C) 4.5 × 10-27 kg D) 3.3 × 10-27 kg E) 8.2 × 10-27 kg
What is the radius of the smallest Bohr orbit?
A) 2.14 × 10-9 m B) 1.12 × 10-9 m C) 1.56 × 10-11 m D) 3.17 × 10-11 m E) 5.29 × 10-11 m
A Hertzsprung-Russell diagram shows stars on a plot of
A) luminosity vs. distance. B) magnitude vs. apparent brightness. C) apparent brightness vs. temperature. D) luminosity vs. temperature.
A rod (length = 10 cm) moves on two horizontal frictionless conducting rails, as shown. The magnetic field in the region is directed perpendicularly to the plane of the rails and is uniform and constant. If a constant force of 0.60 N moves the bar at a constant velocity of 2.0 m/s, what is the current through the 12-? load resistor?
a.
0.32 A
b.
0.34 A
c.
0.37 A
d.
0.39 A
e.
0.43 A