Approximately how many times faster is the speed of light in vacuum than the speed of sound in air?
[Ques. 2] A solid state pulsed laser has an energy of 400 mJ per pulse. If its wavelength is 1.06 106 m, how many photons are in each pulse?
a. 2 1025
b. 2 1021
c. 3 1018
d. 6 1038
e. 2 1018
[Ques. 3] Kepler's first law of planetary motion is known as the law of ______________ paths.
Fill in the blank(s) with correct word
[Ques. 4] How many times greater is the speed of red light ( = 700 nm) than the speed of violet light ( = 400 nm) in a vacuum?
[Ques. 5] Assume electrons are accelerated through a potential difference of 25000 V inside a TV picture tube. What is the minimum wavelength that could be produced when the electrons strike the phosphor? (1 = 1010 m)
a. 0.50
b. 1.0
c. 10
d. 100
e. 0.25
[Ques. 6] T2 = kR3 is known as ______________.
Fill in the blank(s) with correct word
[Ques. 7] What are the wavelength limits, in meters, of the audible region of the sound spectrum (v = 344 m/s)?
[Ques. 8] How much energy is in an 89.7 MHz photon of FM-radiation?
a. 2.2 1033 J
b. 9.5 1027 J
c. 7.4 1042 J
d. 5.9 1026 J
e. 3.7 1025 J
[Ques. 9] The Earth-centered model of the solar system is called the ______________ model.
Fill in the blank(s) with correct word
[Ques. 10] A radar pulse returns 3.0 10-4 s after it was sent out and reflected by an object. What is the separation distance of the radar source and the object?
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