20．表面織構符號在文字中為NMR 0.008-0.8/Ra 3.2時，在圖面上之標註符號為?
(A)
(B)
(C)
(D)

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相關試題

27. 表面織構符號在文字中為 MRR 0.0025-0.8/Rz 3.2 時，在圖面上之標註符號為？(A)(B)(C)(D)

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2. A sphere with radius a contains a uniform volume charge density ofρvin the region: 0 ＜ r ＜ a. If the sphere is isolated by a conducting spherical shell with inner radius b and outer radius c placed concentrically, as shown in figure. What is the electric field intensity in the region b ＜ r ＜ c?(A)(B)(C)(D)(E)None of the above

3. A straight wire carrying a current I in the z direction is located along the z axis in free space. If the wire is infinitely long and infinitely thin, what is the magnetic field intensity at the point (0, L, 0) in rectangular coordinate system?(A)(B)(C)(D)(E)None of the above

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5. A uniform electromagnetic plane wave is traveling in free space and its electric field is given by E = 5cos(ωt-2z)ax V/m, what is the angular frequency, ω in (rad/s), of the plane wave?(A)3✖108(B)6✖108(C)6✖109(D)6.28✖108(E)None of the above

6. A long core-shell structure is made to transmit an optical wave through total internal reflection within the core region. If the refractive indices for the core and the shell are respectively n1 = 1.5 and n2 = 3.0, as depicted in the figure. What is the minimum value of the angle \(\theta\) for a successful transmission?(A)30°(B)45°(C)60°(D)90°(E)None of the above

7. An object is placed at the position being 20 cm from a convex lens with the focal length of 10 cm. What is the distance between the image and the lens?(A)20 cm(B)10 cm(C)40 cm(D)30 cm(E)None of the above

8. The spherical waves of wavelength \(\lambda\) emitted from a single point source are passing through two small holes, S1 and S2, which are separated by the distance of a, as shown in the figure. If c >> a, what is the approximated condition for destructive interference at a point P on the screen?(A)asinθ =1.5λ(B)asinθ =1.5λ(C)c sinθ=λ(D)b tanθ=λ(E)a sinθ =λ

9. A laser beam of wavelength \(\lambda\) shined on a spectrometer with the grating spacing a is split into two beams of wavelengthsλ1 and λ2 due to the 2nd order diffraction. If λ2 is slightly longer than λ1 and θ is the diffraction angle for \(\lambda_1\), what is the difference in diffraction angles of the two beams?(A)(B)(C)(D)(E)None of the above

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