A metallic sheet has a large number of parallel slits, 5.0 mm wide and 20 cm apart. This sheet is used as a diffraction grating for microwaves
A wide parallel beam of microwaves is incident normally on the sheet. If the intensity maxima occur 2.0° apart in the central region, what is the wavelength of the microwaves?
A) 9.0 mm B) 7.0 mm C) 6.0 mm D) 5.0 mm E) 8.0 mm
B
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The jovian planets
A) all lie less than 5 AU from the Sun. B) all have rings around their equators. C) all spin slower than the Earth. D) have satellite systems with less than 4 moons. E) are all much more dense than any of the terrestrials planets.
An inventor wants you to finance construction of a machine that will run at room temperature by using the free thermal energy available in the air itself. Should you invest $100,000? Why or why not?
What will be an ideal response?
Charge of uniform linear density (4.0 nC/m) is distributed along the entire x axis. Determine the magnitude of the electric field on the y axis at y = 2.5 m
a. 36 N/C b. 29 N/C c. 43 N/C d. 50 N/C e. 58 N/C
What is the potential difference across C2 when C1 = 5.0 ?F, C2 = 15 ?F, C3 = 30 ?F, and V0 = 24 V?
a.
21 V
b.
19 V
c.
16 V
d.
24 V
e.
8.0 V