A film of index of refraction n1 coats a surface with index of refraction n2. When n1>n2, the condition for constructive interference for reflected monochromatic light of wavelength ? in air is
A.
.B.
.C.
.D.
.E.
.Answer: D
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The potential energy of a spring is 0.25 J when it is compressed 0.04 m to the left of its equilibrium position. This is its leftmost position. What is its kinetic energy when it returns to the equilibrium point?
A. zero B. -0.3 J and moving to the left C. 0.3 J and moving to the right D. 0.3 J and at rest
When an unstable W nucleus undergoes gamma decay, the nucleus formed is that of
a. W. b. Os. c. Ta. d. Hf. e. Re.
Vector quantities are represented in terms of their magnitude and direction
Indicate whether the statement is true or false
A positive charge is fixed at the origin. A negative charge is moved along the x-axis from x = 50 cm to x = 10 cm. The potential energy of the system
A. increases. B. does not change. C. decreases.