Optionals IAS Mains Physics: Questions 200 - 205 of 307

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Question 200

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Appeared in Year: 2005

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Essay▾

Differentiate between Rayleigh and Raman scatterings. Why is Raman scattering considered to be a breakthrough in molecular spectroscopy? What are the advantages of using laser light in Raman spectroscopy?

Explanation

Raman scattering: when electromagnetic radiation passes through pure transparent substance (i.e.. solid, liquid or gas) , it may undergo scattering in addition to absorption and transmission. If is intensity of incident radiation and , and are intensities of the scattered, transmitted and absorbed radiation respectively then,

The scattered radiat…

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Question 201

Generalised Coordinates and Momenta
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Appeared in Year: 2005

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What are constrains of motion, explain with example the holonomic and non-holonomic constraints. Discuss with how one can overcome the limits of constraints by introducing generalised coordinates.

Explanation

Constraints: often the motion of a particle or system of particles is restricted by one or more conditions. The limitations on the motion of a system are called constraints and the motion is said to be constrained motion.

Holonomic Constraints: constraints limit the motion of a system the number of independent coordination, needed to describe the mo…

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Question 202

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Appeared in Year: 2017

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Define moment of inertia and explain its physical significance. Calculate the moment of inertia of an annular ring about an axis passing through its centre and perpendicular to its plane. (Paper-1)

Explanation

As we know that mass is taken to be a measure of inertia for linear or translator motion. In exactly the same manner a body free to rotate about an axis opposes any change in its state of rest or uniform motion. In other words, it possesses inertia for rotational motion i.e.. it opposes the torque or the moment of the couple applied to it to change…

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Question 203

Appeared in Year: 2017

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Write down the quark constituents of each of the following: (Paper-2)

(1)

(2)

(3)

(4)

(5)

Explanation

(1)

(2)

(3)

(4)

(5)

In particle physics, a pion is any of three subatomic particles: π 0 , π + , and π . Each pion consists of a quark and an antiquark and is therefore a meson.

In particle physics, a kaon, also called a K meson and denoted K , is any of a group of four mesons distinguished by a quantum number called strangeness. In the quark mode…

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Question 204

Holography and Simple Applications
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Appeared in Year: 2005

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Essay▾

Why does one get three – dimensional image is holography? Explain with appropriate figures how one can construct and read a hologram.

Explanation

Holography is a two step process. First step is the recording of hologram where the object is transformed into a photographic record and second step is the reconstruction in which the hologram is transformed into the image. Unlike in the conventional photography, lens isn՚t required in either of the steps. A hologram is the result of the interferen…

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Question 205

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Appeared in Year: 2010

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Derives Bohr՚s angular momentum quantization condition in Bohr՚s atomic model from the concept of de Broglie waves.

Explanation

One of the postulates that Bohr used in formulating a model of atom is that the angular momentum L of the electron revolving in a stationary orbit is quantized.

Thus

The above postulate of Bohr directly follows from the concept of matter waves. If a stretched string is fastened of both ends and is made to vibrate, standing waves are formed provided …

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