Power of the beam = 10J/0.1*10^-3 = 10^5 W
Now since the surface is reflective this force it imparts on the spot will be given as
F = 2P/c where c is the velocity of light in free space
F = 2*10^5/3*10^8 = 6.67*10^-4N
Pressure = force /area = F/π(0.5*10^-3)^2 = 849.25Pa
A laser emitted a 0.1 ms long pulse of light with total energy 10 J. The...
A laser emitted a 0.1 ms long pulse of light with total energy 10 J. The average pressure of such a pulse focused on a spot of diameter 1mm on a fully reflective surface is: O A. 850 Pa B. 0.17 mN C. 6.6 N/m2 D. None of the above
A laser emitted a 0.1 ms long pulse of light with total energy 10 J. The average pressure of such a pulse focused on a spot of diameter 1mm on a fully reflective surface is: A. 850 Pa B. 0.17 ms C. 6.6 N/m2 D. None of the above
A laser emitted a 0.1 ms long pulse of light with total energy 10 J. The average pressure of such a pulse focused on a spot of diameter 1mm on a fully reflective surface is: A. 850 Pa B. 0.17 mN C. 6.6 N/m2 D. None of the above
A laser emitted a 0.1 ms long pulse of light with total energy 10 J. The average pressure of such a pulse focused on a spot of diameter 1mm on a fully reflective surface is: A 850 Pa B. 0.17 mN C. 6.6 N/m2 D. None of the above
A laser emitted a 0.1 ms long pulse of light with total energy 10 J. The average pressure of such a pulse focused on a spot of diameter 1mm on a fully reflective surface is: A. 850 Pa B. 0.17 mN C. 6.6 N/m2 D. None of the above
A laser emitted a 0.1 ms long pulse of light with total energy 10 J. The average pressure of such a pulse focused on a spot of diameter 1mm on a fully reflective surface is:
A laser emitted a 0.1 ms long pulse of light with total energy 10 J. The average pressure of such a pulse focused on a spot of diameter 1mm on a fully reflective surface is: OA. 850 Pa B. 0.17 mN OC. 6.6 N/m2 D. None of the above The index of refraction of germanium is 5.5. The critical angle for total internal reflection, at germanium/air interface is about: A. 800 OB. 340 C. 60° D. None of the above...
A laser used in eye surgery emits a 2.20-mJ pulse in 1.00 ns, focused to a spot 45.0 µm in diameter on the retina. (a) Find (in SI units) the power per unit area at the retina. (This quantity is called the irradiance.) W/m2 (b) What energy is delivered per pulse to an area of molecular size (say, a circular area 0.400 nm in diameter)? J
A large laser emits an intense pulse of light delivering an energy of 5080J in 8.40×10-3s. If the frequency of the light is 5.94×1014Hz, how many photons are emitted in this pulse?
Practice Exercise. A laser emits a pulse of light containing 3.74 x 10-16 J of energy at a frequency of 5.77 x 1013 Hz. How many photons are present in the pulse? (Answer: 9780 photons)