Question

The number of photons that each pulse delivers to the blemish is

• A. $1.5\times {10}^{16}$
• B. $1.5\times {10}^8$
• C. $3\times {10}^{16}$
• D. $3\times {10}^8$

Answer 1

The correct option is A $1.5\times {10}^{16}$

Number of photons $=\upsilon =\frac{C}{\lambda }$

$=\frac{3\times {10}^8\times {10}^9}{585}$

$=5.12\times {10}^{14}$

Number of photons $=0.05\times {10}^{16}\simeq$ Closer to $1.5\times {10}^{16}$