The Concentration of Photons in a Uniform Light Beam with a Wavelength

question 59

Multiple Choice

The concentration of photons in a uniform light beam with a wavelength of 500 nm is 1.7 *10¹³ m ^{- 3}.The intensity of the beam is:

• A)6.8 * 10 ^{- 6} W/m²
• B)3.2* 10² W/m²
• C)1.0 * 10³ W/m²
• D)2.0 *10³ W/m²
• E)4.0 F*10³ W/m²