Two lasers each produce 6.00 mW beams. The beam of laser B is wider, having twice the cross-sectional area as the beam of laser A.
Which of the following statements about these two laser beams is correct? (THERE MAY BE MORE THAN ONE CORRECT CHOICE.)
A. Both of the beams have the same average power.
B. Beam A has twice the intensity of beam B.
C. Beam B has twice the intensity of beam A.
D. Both beams have the same intensity.
2007-12-09 06:03:46 · 2 answers · asked by ~Brigit~ 2 in Science & Mathematics ➔ Physics
the correct choice are A and B
A is correct since from the statement they both produce 6 mW, whatever the width of the beam, average power will be the same as what is given
B is correct since intensity is inversely proportional to the area. with same amount of power the smaller area it has the greater the intensity, since laser B has wider area, it follows that its intensity is lower.
2007-12-11 13:53:24 · answer #1 · answered by ronald 3 · 0⤊ 0⤋
A. Both of the beams have the same average power: 6.00mW
B. Beam A has twice the intensity of beam B: intensity is inversely proportional to the beam size.
2007-12-11 22:07:51 · answer #2 · answered by Hahaha 7 · 0⤊ 0⤋