Light as Wave

Q.

What is the longest wavelength present in the Balmer series of hydrogen?

Q. Consider a tank made of glass $\text{(refractive index 1.5)}$ with a thick bottom. It is filled with a liquid of refractive index $\mu$. A student finds that, irrespective of what the incident angle $i$ (see figure) is for a beam of light entering the liquid, the light reflected from the liquid glass interface is never completely polarized. For this to happen, the minimum value of $\mu$ is:

1. $\sqrt{\frac{5}{3}}$
2. $\frac{5}{\sqrt{3}}$
3. $\frac{3}{\sqrt{5}}$
4. $\frac{4}{3}$

Q. Wave nature of light can be explained because

1. Light rays travel in a straight line
2. Light exhibits the phenomena of reflection and refraction
3. Light exhibits the phenomenon of interference
4. Light causes the phenomenon of photoelectric effect

Q. By corpuscular theory of light, the phenomenon which can be explained is

1. Refraction
2. Interference
3. Diffraction
4. Polarisation

Q. Which among the following is a form of energy?

1. Light
2. Pressure
3. Momentum
4. Power

Q. Interference of light provides evidence for the fact that

1. light travels with a high speed
2. light is wave phenomenon
3. light is transverse wave
4. light is electromagnetic in nature

Q.

Electrons are emitted from metal surface when light falls on it . Is this statement true or false ?

Q. Wave nature of light can be explained because

1. Light rays travel in a straight line
2. Light exhibits the phenomena of reflection and refraction
3. Light exhibits the phenomenon of interference
4. Light causes the phenomenon of photoelectric effect

Q.

The dual nature of radiation is shown by

1. Photoelectric effect alone

2. Diffraction and reflection

3. Photoelectric effect and diffraction

4. Refraction and diffraction

Q.

A point source is placed at a depth h below the surface of water (refractive index $=\mu$).

(a) Show that light escapes through a circular area on the water surface with its centre directly above the point source.

(b) Find the angle subtended by a radius of the area on the source.

Q. Light have wave nature because

Q.

Is light a particle?

Q. The part of the spectrum of the electromagnetic radiation used to cook food is

​​​​​​​$[$1 Mark$]$

1. ultraviloet rays
2. cosmic rays
3. X-rays
4. microwaves

Q.

Which is valid when Fresnal distance is equal to D ( D =distance between the slit and screen]

Diffraction or ray optics

I know that diffraction is valid when it is much less than D ....

Greater than D then ray optics is valid

What if they are equal???

Pls ans in detail ☺

Q.

When light falls on matter, it can produce

1. mechanical effect only

2. chemical effect only

3. heating effect only

4. all of the above

Q.

An electromagnetic wave travelling through a transparent medium is given by $E_x(y,t)=E_{ox}sin2\pi [\frac{y}{5\times {10}^{-7}}-4\times {10}^{14}t]$ in SI units. Then what is the refractive index of the medium?

1. 1

2. 1.5

3. 1.8

4. 2

Q.

A beam of light consists of several rays. Yes or No?

Q. If ${\lambda }_v,{\lambda }_x,{\lambda }_m$ represent the wavelengths of visible light, $X$-rays and microwaves respectively, then

1. ${\lambda }_m>{\lambda }_x>{\lambda }_v$
2. ${\lambda }_m>{\lambda }_v>{\lambda }_x$
3. ${\lambda }_v>{\lambda }_x>{\lambda }_m$
4. ${\lambda }_v>{\lambda }_m>{\lambda }_x$

Q.

Sunlight passing through a small rectangular hole may be called as:

1. convergent beam

2. divergent beam

3. parallel beam

4. none of the above

Q. A wave or a pulse is reflected normally from the surface of a denser medium back into the rarer medium. The phase change caused by the reflection-

1. $0$
2. $\pi /2$
3. $\pi$
4. $3\pi /2$

Q. Suppose VIBGYOR is passed through a gas. If dark spectral lines are seen in place of indigo, green and red on a photographic plate. The absorbed color is -

1. Only indigo
2. Only green
3. Only red
4. All of these

Q. Assertion (A) : Corpuscular theory fails in explaining the velocity of light in air to water.

1. A and R are true R is correct explanation for A
2. A and R are true R is not correct explanation for A
3. A is false but R is true
4. A is true but R is false

Q. Before getting knocked out from the metal surface, the photoelectrons -

1. never suffer collisions inside the metal.
2. may suffer collisions inside the metal.
3. Data insufficient
4. None of these

Q. The electrons with small velocities were emitted, if certain metals,

1. are irradiated by ultra violet rays.
2. heated to high temperatures.
3. Both $\left(a\right)$ and $\left(b\right)$
4. Neither $\left(a\right)$ nor $\left(b\right)$

Q. Light is a form of .........

1. Energy
2. Wave
3. none
4. Both

Q. A beam of light consists of a bundle of light rays.

1. True
2. False

Q. Assertion :If we look clearly at the shadow cast by an opaque object, close to the region of geometrical shadow, alternate dark and bright regions can be seen Reason: This happens due to the phenomenon of interference.

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. Fill in the blank and explain
To discover a sunken ship or objects deep inside the sea, ............... technology is used.

Q. a grating has 5.7 *10^3 lines per cm. if x rays of wavelength is 546 nm and is incident on grating find the angle of reflection for the first order diffraction maximum.

Q. When light falls on matter, it can produce :

1. mechanical effect
2. chemical effect
3. heating effect
4. all the above