The symbol for the element with the highest electronegativity is ______________
Indicate whether the statement is true or false
F
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A hydrogen atom is excited to the n = 10 stated. It then decays to the n = 4 state by emitting a photon which is detected in a photographic plate
What is the frequency of the detected photon? The lowest level energy state of hydrogen is -13.6 eV. (h = 6.626 × 10-34 J ? s, 1 eV = 1.60 × 10-19 J) A) 3.46 × 1014 Hz B) 0.865 × 1014 Hz C) 1.27 × 1014 Hz D) 4.05 × 1014 Hz E) 1.73 × 1014 Hz
How many moles are there in 2.00 kg of copper? The atomic weight of copper is 63.5 g/mol and its density is 8.90 g/cm3
A) 31.5 B) 15.3 C) 53.1 D) 51.3
The pupil of the human eye is approximately 0.8 cm in diameter when adapted to the dark. The ratio of the light-gathering power of a 1.6-m telescope to that of the human eye is ____
a. 2 b. 4 c. 20 d. 400 e. 40,000
A camera lens having a 50-mm focal length is set to f/4.0. What is the minimum spacing of two objects located 12 m from the lens if the objects are just barely resolved in the image using light of wavelength 500 nm?
A) 4.9 × 10-5 m B) 0.024 mm C) 0.59 mm D) 4.72 mm E) 1.66 mm