The half life of uranium-232 is 70 years. The time for 3/4 of a sample of uranium-232 to decay is 105 years

Indicate whether the statement is true or false


F

Physics & Space Science

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A rectangular plate in plane stress is subjected to normal stresses ?x 5 35 MPa, ?y 5 26 MPa, and shear stress ?xy 5 14 MPa. The ratio of the magnitudes of the principal stresses (?1/?2) is approximately:


(A) 0.8
(B) 1.5
(C) 2.1
(D) 2.9

Physics & Space Science

What is the wavelength of a monochromatic light beam, where the photon energy is 2.15 eV? (h = 6.63 × 10^?34 J?s, c = 3.00 × 10^8 m/s, 1 nm = 10?9 m, and 1 eV = 1.6 × 10^?19 J)

a. 308 nm b. 578 nm c. 223 nm d. 156 nm e. 475 nm

Physics & Space Science

Earth's rotation axis is approaching Polaris today

a. True b. False Indicate whether the statement is true or false

Physics & Space Science

Planetary geologists now refer to the exterior of the newborn moon as__________

A) a multiringed basin B) a micrometeorite C) a magma ocean D) coronae

Physics & Space Science