Index of Refraction: When light travels from air into water,
A. its velocity, wavelength and frequency all change.
B. its velocity changes, but its frequency and wavelength do not change.
C. its frequency changes, but its velocity and wavelength do not change.
D. its velocity and wavelength change, but its frequency does not change.
E. its wavelength changes, but its velocity and frequency do not change.
Answer: D
You might also like to view...
Two infinitely large black plane surfaces are 0.3 m apart and the space between them is filled by an isothermal gas mixture at 811 K and atmospheric pressure consisting of 25% CO2, 25% H2O, and 50% N2 by volume. If one of the surfaces is maintained at 278 K and the other at 1390 K respectively, calculate
(a) the effective emissivity of the gas at its temperature
(b) the effective absorptivity of the gas to radiation from the 1390 K surface
(c) the effective absorptivity of the gas to radiation from the 278 K surface
(d) the net rate of heat transfer to the gas per square meter of surface area
GIVEN
Two infinitely large black plane surfaces with an isothermal gas mixture between them
Distance between surfaces (s) = 0.3 m
Gas mixture temperature (Tm) = 811 K
Gas mixture pressure = 1 atm
Gas contents: 25% CO2, 25% H2O, 50 % N2 by volume
Surface temperatures
T1 = 278 K
T2 = 1390 K
FIND
(a) The effective emissivity of the gas at its temperature (? mix)
(b) The effective absorptivity of the gas to radiation from A1
(c) The effective absorptivity of the gas to radiation from A2
(d) The net rate of heat transfer to the gas per square meter of surface are (qm/A)
ASSUMPTIONS
Steady state
Convection is negligible
SKETCH
If a person weighs 108 lb on Earth, that person's weight on the Moon would be
a. 648 lb. b. 54 lb. c. 18 lb. d. 108 lb. e. 54 lb.
A particle (charge = 50 ?C) moves in a region where the only force on it is an electric force. As the particle moves 25 cm from point A to point B, its kinetic energy increases by 1.5 mJ. Determine the electric potential difference, VB ? VA
a. ?50 V b. ?40 V c. ?30 V d. ?60 V e. +15 V
Diffraction Gratings: A diffraction grating with 396 lines/mm is illuminated with light of wavelength 343 nm. What is the angular separation between the two second-order bright fringes?
A. 31.5° B. 15.8° C. 32.9°