The speed of sound in air at 0
is 331 m/s. What is the velocity of sound in air at a temperature of-30
?
A. 308 m/s
B. 310 m/s
C. 312 m/s
D. 314 m/s
E. 316 m/s
C. 312 m/s
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What do we mean by the star-gas-star cycle?
A) It is the idea that stars in close binary systems can exchange gas with one another. B) It is the set of nuclear reactions by which heavy elements are produced in the cores of massive stars. C) It describes the orbits of the stars and interstellar medium around the center of the galaxy. D) It is the continuous recycling of gas in the galactic disk between stars and the interstellar medium.
Two bodies can be in thermal equilibrium with one another when they are at the same temperature even if they
a. absorb different quantities of thermal energy from their surroundings in equal time intervals. b. have different masses. c. have different volumes. d. have any of the properties listed above. e. have any of the properties listed above and one of them is contact with a third body at a different temperature.
X-rays are more intense than radio waves
Indicate whether the statement is true or false
If total internal reflection occurs at a glass-air surface:
a. no light is reflected. b. no light is refracted. c. light is leaving the air and hitting the glass with an incident angle less than the critical angle. d. light is leaving the air and hitting the glass with an incident angle greater than the critical angle.