How many photons are emitted by a laser source of $5 \times 10^{-3} \,W$ operating at $632.2 \,nm$ in $2 \,s$ is .......$\times 10^{16}$ $\left(h=6.63 \times 10^{-34} \,Js \right)$
How many photons are emitted by a laser source of $5 \times 10^{-3} \,W$ operating at $632.2 \,nm$ in $2 \,s$ is .......$\times 10^{16}$ $\left(h=6.63 \times 10^{-34} \,Js \right)$
- A
$3.2$
- B
$1.6$
- C
$4$
- D
$0.4$
Similar Questions
The threshold wavelength for photoelectric effect of a metal is $6500 \mathring A$. The work function of the metal is approximately .......... $eV$
One day on a spacecraft corresponds to $2$ days on the earth. The speed of the spacecraft relative to the earth is
One day on a spacecraft corresponds to $2$ days on the earth. The speed of the spacecraft relative to the earth is
The energy of a photon is $E = hv$ and the momentum of photon $p = \frac{h}{\lambda }$, then the velocity of photon will be
The energy of a photon is $E = hv$ and the momentum of photon $p = \frac{h}{\lambda }$, then the velocity of photon will be
A photon of wavelength $4400 \, \mathring A$ is passing through vacuum. The effective mass and momentum of the photon are respectively
Compton effect supports that
Compton effect supports that