An electron is in an infinite square well that is 2.6 nm wide. What is the smallest value of the state quantum number n for which the energy level exceeds 100 eV? (h = 6.626 × 10-34 J ? s, mel = 9.11 × 10-31 kg, 1 eV = 1.60 × 10-19)
A) 43
B) 44
C) 45
D) 42
E) 41
A
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When a colored light in air shines on water and is refracted, its frequency
A) decreases. B) remains unchanged. C) increases.
Two identical grasshoppers jump with the same initial speed. Grasshopper A goes straight up, but grasshopper B goes up at a 66° angle above the horizontal. Assume no air resistance and choose your system to be grasshopper-Earth
Which of the following statements about these grasshoppers are correct? (There could be more than one correct choice.) A) At their highest point, both systems have the same amount of gravitational potential energy. B) At their highest point, both systemshave the same amount of kinetic energy. C) At their highest point, both systemshave the same amount of mechanical energy. D) At their highest point, grasshopper B is moving faster than grasshopper A. E) At their highest point, the system grasshopper A-Earth has more gravitational potential energy than the system grasshopper B-Earth.
Based on atomic size, which would you expect to be more soluble in water: helium, He, or nitrogen, Image?
A) Although He is smaller, its outer orbital is filled and the atom will have little attraction to the water molecules. B) Since He atoms are smaller, more of them can fit into solution, so it has a higher solubility in water. C) Nitrogen atoms are bigger and so nitrogen molecules should be more soluble in water due to greater dipole-induced dipole attractions. D) He atoms are bigger and so helium molecules should be more soluble in water due to greater dipole-induced dipole attractions.
Fill a U-tube with water and the level in both ends is the same. Water seeks its own level. Why?
What will be an ideal response?