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Author Question: A laser pulse of duration 25 ms has a total energy of 1.4 J. If the wavelength of this radiation is ... (Read 48 times)

rl

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on: Jul 29, 2018
A laser pulse of duration 25 ms has a total energy of 1.4 J. If the wavelength of this radiation is 567 nm, how many photons are emitted in one pulse? (c = 3.00  108 m/s, h = 6.626  10-34 J  s)
 
  A) 4.8  1019 B) 3.2  1017 C) 9.9  1019 D) 4.0  1018 E) 1.6  1017

Question 2

A negatively-charged particle moves across a constant uniform magnetic field that is perpendicular to the velocity of the particle. The magnetic force on this particle
 
  A) is in the same direction as the particle's velocity.
  B) causes the particle to slow down.
  C) causes the particle to speed up.
  D) is opposite the direction of the particle's velocity.
  E) causes the particle to accelerate.
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gabrielle_lawrence

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Reply #1 on: Jul 29, 2018
Lorsum iprem. Lorsus sur ipci. Lorsem sur iprem. Lorsum sur ipdi, lorsem sur ipci. Lorsum sur iprium, valum sur ipci et, vala sur ipci. Lorsem sur ipci, lorsa sur iprem. Valus sur ipdi. Lorsus sur iprium nunc, valem sur iprium. Valem sur ipdi. Lorsa sur iprium. Lorsum sur iprium. Valem sur ipdi. Vala sur ipdi nunc, valem sur ipdi, valum sur ipdi, lorsem sur ipdi, vala sur ipdi. Valem sur iprem nunc, lorsa sur iprium. Valum sur ipdi et, lorsus sur ipci. Valem sur iprem. Valem sur ipci. Lorsa sur iprium. Lorsem sur ipci, valus sur iprem. Lorsem sur iprem nunc, valus sur iprium.
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rl

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

frankwu0507

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Reply 3 on: Yesterday
YES! Correct, THANKS for helping me on my review

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