10^{20} photons of wavelength 660 nm are emi | vedclass

Name: Exam Paper Generator | JEE NEET Paper Generator | Vedclass
Brand: Vedclass
Rating: 5 (35 reviews)

Question

(A) The power $P$ of the lamp is given by the total energy emitted per second, which is the product of the number of photons emitted per second $N$ an

Vedclass · Accepted Answer

$30$

Vedclass · Answer

(A) The power $P$ of the lamp is given by the total energy emitted per second, which is the product of the number of photons emitted per second $N$ and the energy of a single photon $E = \frac{hc}{\lambda}$.Given: $N = 10^{20} \ s^{-1}$, $\lambda = 660 \ nm = 660 	imes 10^{-9} \ m$, $h = 6.6 	imes 10^{-34} \ J \cdot s$, and $c = 3 	imes 10^8 \ m/s$.$P = N 	imes \frac{hc}{\lambda}$$P = 10^{20} 	imes \frac{6.6 	imes 10^{-34} 	imes 3 	imes 10^8}{660 	imes 10^{-9}}$$P = 10^{20} 	imes \frac{19.8 	imes 10^{-26}}{660 	imes 10^{-9}}$$P = 10^{20} 	imes 0.03 	imes 10^{-17}$$P = 30 \ W$.

$10^{20}$ photons of wavelength $660 \ nm$ are emitted per second from a lamp. The wattage of the lamp is (Planck's constant $h = 6.6 \times 10^{-34} \ J \cdot s$). (in $W$)

Similar Questions

The rest energy of an electron is

$A$ photon creates an electron-positron pair with equal kinetic energy. If the kinetic energy of each particle is $0.29 \ MeV$,the energy of the photon must be .......... $MeV$.

$A$ photon of frequency $v$ has a momentum associated with it. If the speed of light is $c$,then the momentum is .......

Which of the following phenomena cannot be explained by the wave theory of light?

The ratio of energies of photons with wavelengths $\lambda_1 = 150 \ nm$ and $\lambda_2 = 300 \ nm$ is:

Vedclass Test Series

Exam Paper Generator

Online Exam Module