To get the same exposure on the film, when the aperture diameter of a camera lens is doubled, what change should be made in the shutter speed?
A. it should be doubled
B. it should be halved
C. it should be quadrupled
D. it should be quartered
E. it should be reduced by a factor of 1.414
D. it should be quartered
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Force on a Moving Charge: A charged particle that is moving in a static uniform magnetic field
A. will always experience a magnetic force, regardless of its direction of motion. B. may experience a magnetic force which will cause its speed to change. C. may experience a magnetic force, but its speed will not change. D. may experience a magnetic force, but its direction of motion will not change. E. None of these statements are true.
Parallel-Plate Capacitor: Each plate of an ideal air-filled parallel-plate capacitor has an area of 0.0020 m2, and the separation of the plates is 0.090 mm. An electric field of 2.1 × 106 N/C is present between the plates. What is the surface charge density on the plates? (?0 = 8.85 × 10-12 C2/N ? m2)
A. 19 µC/m2 B. 39 µC/m2 C. 9.3 µC/m2 D. 28 µC/m2 E. 47 µC/m2
Compounds that occur in gaseous form at room temperature are ______________ compounds
Fill in the blank(s) with correct word
Most pulsars have a measured mass of:
A) about 1.4 solar masses. B) less than 1.0 solar masses. C) between 2 and 4 solar masses. D) 5.2 solar masses. E) greater than 10 solar masses.