A Laser Emits Light of Wavelength 463 Nm During a Brief

Multiple Choice

A laser emits light of wavelength 463 nm during a brief pulse that lasts for 25 ms and has a total energy of 1.2 J. How many photons are emitted in that single pulse? (c = 3.00 × 10⁸ m/s, h = 6.626 × 10^-34 J ∙ s)

A) 2.8 × 10¹⁸
B) 6.9 × 10¹⁹
C) 3.4 × 10¹⁹
D) 1.1 × 10¹⁷
E) 2.2 × 10¹⁷