The Japanese name for the asterism we call the Pleiades

Energy Levels: The shortest wavelength of a photon that can be emitted by a hydrogen atom, for which the initial state is n = 12, is closest to which one of the following values? (c = 3.0 × 108 m/s, h = 6.626 × 10-34 J ? s, 1 eV = 1.60 × 10-19 J)

A. 92 nm B. 82 nm C. 72 nm D. 62 nm E. 52 nm

A certain isotope has a half-life of 32.4 hr and a relative biological effectiveness of 3.50. A sample of this isotope initially delivers an absorbed dose of 0.240 Gy to 250 g of tissue

(a) What was the initial equivalent dose to the tissue in rem and in sieverts? (b) How many joules of energy did the 250-g sample initially receive from the isotope? What will be an ideal response?

A) If you are on the near side of the Moon, the side facing Earth, describe what you would see of Earth over one lunar cycle. b) If you are on the far side of the Moon, the side facing away from Earth, describe what you would see of Earth over one lunar cycle

What will be an ideal response?

Index of Refraction: If the index of refraction of a material is 2, this means that light travels

A. 2 times as fast in air as it does in vacuum. B. 2 times as fast in the material as it does in air. C. 2 times as fast in vacuum as it does in the material. D. 2 times as fast in the material than it does in vacuum. E. 1/2 as fast in air as it does in the material.