Biology Forums - Study Force

Approximately how many times faster is the speed of light in vacuum than the speed of sound in air?

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[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

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[Ques. 3] Kepler's first law of planetary motion is known as the law of ______________ paths.
 Fill in the blank(s) with correct word

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[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?

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[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

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[Ques. 6] T2 = kR3 is known as ______________.
 Fill in the blank(s) with correct word

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[Ques. 7] What are the wavelength limits, in meters, of the audible region of the sound spectrum (v = 344 m/s)?

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[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

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[Ques. 9] The Earth-centered model of the solar system is called the ______________ model.
 Fill in the blank(s) with correct word

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[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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