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Author Question: One of the harmonics of a string fixed at both ends has a frequency of 52.2 Hz and the next higher ... (Read 62 times)

ts19998

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on: Jul 29, 2018
One of the harmonics of a string fixed at both ends has a frequency of 52.2 Hz and the next higher harmonic has a frequency of 60.9 Hz. What is the fundamental frequency of the string?
 
  A) 26.1 Hz
  B) 8.7 Hz
  C) 4.35 Hz
  D) 30.4 Hz
  E) 17.4 Hz

Question 2

A photocathode having a work function of 2.8 eV is illuminated with monochromatic electromagnetic radiation whose photon energy is 4.0 eV.
 
  What is the threshold (cutoff) frequency for photoelectron production? (1 eV = 1.60  10-19 J, h = 6.626  10-34 J  s)
  A) 6.8  1014 Hz
  B) 2.9  1014 Hz
  C) 7.7  1014 Hz
  D) 8.6  1014 Hz
  E) 9.7  1014 Hz


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frogdreck123456

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Reply #1 on: Jul 29, 2018
Answer to Question 1

B

Answer to Question 2

A


ts19998

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Reply 2 on: Jul 29, 2018
Thanks for the timely response, appreciate it

FergA

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Reply 3 on: Yesterday
Excellent

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