A beam of X-rays of different frequencies is reflected at 10 degrees off a crystal of interatomic spacing 0.2 nm. Which X-ray wavelength is preferentially reflected?
A. 0.0943 nm
B. 0.139 nm
C. 0.0695 nm
D. 1.02 × 10?10 m
E. 3.47 × 10?11 m
Answer: C
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Bulk Modulus: At a depth of 1030 m in Lake Baikal (a fresh water lake in Siberia), the pressure has increased by 100 atmospheres (to about 107 N/m2). By what volume has 1.0 m3 of water from the surface of the lake been compressed if it is forced down to this depth? The bulk modulus of water is 2.3 × 109 Pa.
A. 2.3 × 10-3 m3 B. 3.3 × 10-3 m3 C. 4.3 × 10-3 m3 D. 5.3 × 10-3 m3
A cylindrical tank is assembled by welding steel sections circumfer-entially. Tank diameter is 1.5 m, thickness is 20 mm, and internal pressure is 2.0 MPa. The maximum tensile stress in the cylindrical part of the tank is approximately:
(A) 45 MPa
(B) 57 MPa
(C) 62 MPa
(D) 75 MPa
Distinguish between a solar eclipse and a lunar eclipse, and the reasons for each
What will be an ideal response?
The primary purpose of an astronomical telescope is to magnify the images of distant objects, making them appear closer
Indicate whether the statement is true or false