Wave Particle Duality of Light

Q.

Quantam nature of light is explained by which of the following phenomenon

1. Huygen wave theory

2. Photoelectric effect

3. Maxwell electromagnetic theory

4. de-Broglie theory

Q. According to the Maxwell's electromagnetic wave theory, light consists of electric and magnetic fields which are -

1. inclined at an angle of ${45}^{\circ }$ to each other.
2. parallel to each other.
3. None of these
4. perpendicular to each other.

Q.

who pioneered the quantum field theory?

Q. A parallel beam of light of intensity $I$ and cross section area $S$ is incident on a plate at normal incidence. The photoelectric emission efficiency is $100\%$, the frequency of beam is $v$ and the work function of the plate is $\varphi (hv>\varphi )$. Assuming all the electrons are ejected normal to the plane and with same maximum possible speed. The net force exerted on the plate only due to striking of photons and subsequent emission of electron is

1. $\frac{IS}{hv}\left(\frac{2h}{\lambda }\sqrt{hv-\varphi }\right)$
2. $\frac{2IS}{hv}(\frac{h}{\lambda }+\sqrt{2m(hv-\varphi )})$
3. $\frac{IS}{hv}(\frac{h}{\lambda }+\sqrt{2m(hv-\varphi )})$
4. $\frac{2IS}{hv}(\frac{h}{\lambda }+\sqrt{m(hv-\varphi )})$