Wave Particle Duality of Light

Q.

How many theories of light are there?

Q.

The photoelectric effect can be explained on the basis of

1. Corpuscular theory of light

2. Wave theory of light

3. Electromagnetic theory of light

4. Quantum theory 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. If radiation of energy $5\text{eV}$ is incident on the material with work function of $2.5\text{eV}$ then,

1. Electrons may come out of the metal.
2. Electrons will be emitted definetly.
3. No electrons will come out of the surface.
4. can not be predicted.

Q. Photoelectric Effect and Raman Effect can be explained on the basis of:

1. Newton's Corpuscular theory of light
2. Huygens wave theory of light
3. Maxwell's Electromagnetic theory of light
4. Planck's Quantum theory of light

Q.

what is dual nature of radiation?

Q.

The work function of a substance is 4.0 eV. The longest wavelength of light that can cause photoelectron emission from this substance is approximately

1. 540 nm

2. 400 nm

3. 220 nm

4. 310 nm

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.

Light of wavelength $\lambda$ falls on a metal having work function $\frac{hc}{{\lambda }_0}$. Photoelectric effect will take place only if

1. $\lambda \ge {\lambda }_0$

2. $\lambda \ge 2{\lambda }_0$

3. $\lambda \le {\lambda }_0$

4. $\lambda <\frac{{\lambda }_0}{2}$

Q. Classical physics does not include subjects like:

1. light
2. elementary particles
3. heat
4. mechanics

Q. The work function of a substance is 4.0 eV. The longest wavelength of light that can cause photoelectron emission from this substance is approximately

1. 400 nm
2. 220 nm
3. 310 nm
4. 540 nm

Q.

Which of the following shown particle nature of light

1. Refraction

2. Interference

3. Polarization

4. Photoelectric effect

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. $\frac{2IS}{hv}(\frac{h}{\lambda }+\sqrt{m(hv-\varphi )})$

Q. The work function of a substance is $4eV$. The longest wavelength of light that can cause photoelectron emission from this substance is approximately.

1. 540 nm
2. 310 nm
3. 220 nm
4. 400 nm

Q.

Which of the following shown particle nature of light

1. Refraction

2. Interference

3. Polarization

4. Photoelectric effect

Q. Assertion :Assertion : The basic laws of electromagnetism govern all electric and magnetic phenomena. Reason: Reason : The attempts to unify fundamental forces of nature reflect the quest for unification.

1. If both assertion and reason are true and reason is the correct explanation of assertion.
2. If both assertion and reason are true and reason is not the correct explanation of assertion.
3. If assertion is true but reason is false.
4. If both assertion and reason are false.

Q.

when a metal is illuminated by wavelength

ƛ the stopping potential is 3v when wavelength 2

ƛ is incident on same surface stopping potential is V .threshold wavelength?

Q. a photosensitive surface emits photelectrons when red light falls on it. Will the surface photoelectrons when blue light is incident on it. Give reason.