Question

Number of photons emitted by a 100 W (Js-1) yellow lamp in 1.0 s is
(λ of yellow light is 560 nm)

• A. $1.6×10^{18}$
• B. $1.4×10^{18}$
• C. $2.8×10^{20}$
• D. $2.1×10^{20}$

Answer 1

Answer: (C)

$2.8×10^{20}$

Answer 2

The correct option is (C): $2.8×10^{20}$.