A pulse of light of duration $100 \ ns$ is absorbed completely by a small object initially at rest. Power of the pulse is $30 \ mV$ and the speed of light is $3 \times 10 ^8\ ms ^{-1}$. The final momentum of the object is :
$0.3 \times 10^{-17} \ kg ms ^{-1}$
$1.0 \times 10^{-17} \ kg ms ^{-1}$
$3.0 \times 10^{-17} \ kg ms ^{-1}$
$9.0 \times 10^{-17} \ kg ms ^{-1}$
Frequency of photon having energy $66 eV$ is
Momentum of a photon of wavelength $\lambda$ is
The velocity of photon is proportional to (where $v$ is frequency)
In photo electric effect
$A.$ The photocurrent is proportional to the intensity of the incident radiation.
$B.$ Maximum Kinetic energy with which photoelectrons are emitted depends on the intensity of incident light.
$C.$ Max. $K.E$ with which photoelectrons are emitted depends on the frequency of incident light.
$D.$ The emission of photoelectrons require a minimum threshold intensity of incident radiation.
$E.$ Max. K.E of the photoelectrons is independent of the frequency of the incident light.
Choose the correct answer from the options given below: