#1 is correct. I need the answer for #2 please. A HeNe laser is made up of a cyl

Question

#1 is correct. I need the answer for #2 please.

A HeNe laser is made up of a cylindrical beam of light with a diameter of 0.830 cm. The energy is putsed, lasting for 1.70 ns, and each burst contains an energy of 2.00 J. 1) What is the length of each pulse of laser light? (Express your answer to three significant figures.) 510 You currently have 5 submissions for this question. Only 10 submission are allowed mm Submit You can make 5 more submissions for this question. 2) What is the average eneray per unit volume for each pulse? (Express your answer to three significant figures.) 253.6 You currently have 5 submissions for this question. Only 10 submission are allowed. kJ/m Submit You can make 5 more submissions for this question

Explanation / Answer

a) length = c t = 3 * 108 * 1.7 * 10-9= 0.51 m = 510 mm

b) U = energy / pi r2 l

= 2.00 / (pi/4 * (0.83 * 10-2)2 * 0.51)

= 7.25 * 104 J/m3 = 72 KJ/m3

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