Light incident on a thin film is reflected and transmitted at each surface. Why does a thin film have to be "thin" for an interference pattern to form?
a. Light would not penetrate a thick film.
b. The surfaces of the film must be as close to perfectly parallel as possible. Irregularities would be magnified in a thick film.
c. The thickness of the film must be less than the wavelength of light.
d. Light is not slowed down when it enters into a thin film.
e. Light speeds up as it enters a thin film.
b
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A planet has two small satellites in circular orbits around the planet. The first satellite has a period 18.0 hours and an orbital radius 2.00 × 107 m. The second planet has an orbital radius 3.00 × 107 m. What is the period of the second satellite?
A) 60.8 h B) 12.0 h C) 33.1 h D) 9.80 h E) 27.0 h
Which of the following statements are true about an object in two-dimensional projectile motion if we neglect air? (There could be more than one correct choice.)
A) The speed of the object is constant but its velocity is not constant. B) The acceleration of the object is +g when the object is rising and -g when it is falling. C) The acceleration of the object is zero at its highest point. D) The speed of the object is zero at its highest point. E) The horizontal acceleration is always zero and the vertical acceleration is always a non-zero constant downward.
In the metric system, a penny might be called a(n) ______________ dollar
Fill in the blank(s) with correct word
If each copper atom in a wire were to contribute two conduction electrons instead of just one, its conductivity would
A. increase by a factor of 4. B. increase by a factor of 2. C. remain the same. D. decrease by a factor of 2. E. decrease by a factor of 4.