•At the initial instant the universe contains
•
(a) atoms
(b) Protons
(c) Electons
(d) photons
d
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A 4.0 cm high object is 20. cm in front of a 1.333 Diopter plano-convex lens
(a) Find the image position. Real or Virtual? (b) Find the image size. Erect or Inverted?
The speed of a comet in its orbit around the Sun is ______________ when its distance from the Sun is greatest (aphelion)
a. zero b. reversed c. greatest d. least
At what temperature is the Celsius temperature and the Fahrenheit temperature are same?
A. 30
B. 35
C. -40
D. 45
E. -30
Two mirrors are joined together along a common side, the planes of the mirrors separated by the angle q. If the joined mirrors can be used as a retroreflector when a beam of light strikes both surfaces (one after the other), what is the value of q?
a. 90° c. 45° b. 135° d. 30°