Which statements about images are correct? (There could be more than one correct choice.)
A) A virtual image cannot be viewed by the unaided eye.
B) Mirrors always produce real images because they reflect light.
C) A virtual image cannot be photographed.
D) A real image must be erect.
E) A virtual image cannot be formed on a screen.
E
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Uncertainty Principle Using Momentum and Position: Suppose that the speed of an electron traveling 1.0 km/s is known to an accuracy of 1 part in 10,000 (that is, within 0.01%). What is the minimum uncertainty in the position of this electron? (melectron = 9.11 × 10-31 kg, h = 6.626 × 10-34 J ? s)
Fill in the blank(s) with the appropriate word(s).
Let SI denote the change in entropy of a sample for an irreversible process from state A to state B. Let SR denote the change in entropy of the same sample for a reversible process from state A to state B. Then:
A. SI > SR B. SI = SR C. SI < SR D. SI = 0 E. SR = 0
An electron moving perpendicular to a uniform magnetic field of 0.22 T moves in a circle with a speed of 1.5 × 107 m/s. What is the radius of the circle? (e = 1.60 × 10-19 C, melectron = 9.11 × 10-31kg)
A) 1.5 mm B) 0.22 mm C) 2.2 mm D) 0.39 mm E) 3.9 mm
According to the theory of general relativity, gravity is caused by the ____
a. linear motion of stars b. change in mass of a moving body c. curvature of space-time d. constant speed of light e. inertia of a moving body