The beam in a cathode-ray tube is composed of
A) photons.
B) electrons.
C) both of these
D) neither of these
Answer: B
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A sphere of radius 10.0 cm floats in equilibrium partially submerged in water with its lowest point 5.00 cm below the water's surface. (a) What is the buoyant force acting on the sphere? (b) What is the weight of the sphere?
What will be an ideal response?
Which of the following is an example of a longitudinal wave?
a. sound wave in air c. both a and b b. wave traveling in a string d. neither a nor b
Mouthwash is a good example of
a. a compound. b. a heterogeneous mixture. c. a homogeneous mixture. d. an element.
In hydrogen any transition ending in the ground state emits a photon that
A) may be in the ultraviolet. B) is in neither the ultraviolet nor the infrared. C) may be in the infrared. D) is in the infrared. E) is in the ultraviolet.