The speed of light in a material is What is the critical angle of a light ray at the interface between the material and a vacuum?
A) 30°
B) 21°
C) 24°
D) 27°
Answer: A
You might also like to view...
Diffraction Gratings: A metallic sheet has a large number of parallel slits, 5.0 mm wide and 20 cm apart. This sheet is used as a diffraction grating for microwaves. A wide parallel beam of microwaves is incident normally on the sheet. If the microwave wavelength is 6.0 cm, what is the largest angle from the normal, at which an intensity maximum occurs?
A. 64° B. 69° C. 74° D. 79° E. 84°
Internal energy in thermodynamics is the same as
A) temperature. B) thermal energy. C) heat. D) all of the above
When an object is released from rest and falls in the absence of friction, which of the following is true concerning its motion?
A) Its velocity is constant. B) Both its acceleration and its velocity are constant. C) Neither its acceleration nor its velocity is constant. D) Its acceleration is constant.
A moderate force will break an egg. However, an egg dropped on the road usually breaks, while one dropped on the grass usually doesn't break. This is because for the egg dropped on the grass:
a. the change in momentum is greater. b. the change in momentum is less. c. the time interval for stopping is greater. d. the time interval for stopping is less.