A sound wave in helium has an intensity of 
The density of helium is 0.179
and the velocity of sound in helium is 965 m/s. The pressure amplitude of the sound wave is
A. 
B. 
C. 
D. 
E. 
D.
Physics & Space Science
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How many molecules are there in 14 grams of nitrogen gas?
a. NA/2 b. NA c. 2 NA d. The answer is not given.
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A packet, or quantum of light or any other type of electromagnetic radiation is called
a) an energy level. b) a photon. c) an excited state. d) a discrete bundle.
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You feel warm from the sun at the beach because of heat radiation
Indicate whether the statement is true or false
Physics & Space Science
The first observations of objects in the solar system that orbited neither the sun nor Earth were made by ____________________
Fill in the blank(s) with correct word
Physics & Space Science