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Important Questions on Dual Nature of Radiation and Matter

EASY

Physics>Modern Physics>Dual Nature of Radiation and Matter>Wave Nature of Matter

An electron is accelerated through a potential difference of

10,000 V .

Its de Broglie wavelength is (nearly):

(m_{e} = 9 \times 1 0^{- 31} k g)

EASY

Physics>Modern Physics>Dual Nature of Radiation and Matter>Wave Nature of Matter

In an electron microscope, the resolution that can be achieved is of the order of the wavelength of electrons used. To resolve a width of

7.5 \times 10^{- 12} m,

the minimum electron energy required is close to:

EASY

Physics>Modern Physics>Dual Nature of Radiation and Matter>Wave Nature of Matter

The de-Broglie wavelength of a neutron in thermal equilibrium with heavy water at a temperature

T

(Kelvin) and mass

m

is:

EASY

Physics>Modern Physics>Dual Nature of Radiation and Matter>Wave Nature of Matter

Write down de Broglie's relation and explain the terms therein.

MEDIUM

Physics>Modern Physics>Dual Nature of Radiation and Matter>Wave Nature of Matter

With the help of a labelled diagram, explain the working of a step-up transformer.

MEDIUM

Physics>Modern Physics>Dual Nature of Radiation and Matter>Wave Nature of Matter

What is the de Broglie wavelength of a ball of mass $0.060 Kg$ moving at a speed of $1.0 m / s$ ?

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Physics>Modern Physics>Dual Nature of Radiation and Matter>Wave Nature of Matter

The energy associated with electric field is

(U_{E})

and with magnetic field is

(U_{B})

for an electromagnetic wave in free space. Then:

MEDIUM

Physics>Modern Physics>Dual Nature of Radiation and Matter>Wave Nature of Matter

A plane electromagnetic wave of frequency

50 M H z

travels in free space along the positive

x

- direction. At a particular point in space and time,

\vec{E} = 6.3 \hat{j} V / m,

The corresponding magnetic field

\vec{B}

, at that point will be:

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Physics>Modern Physics>Dual Nature of Radiation and Matter>Wave Nature of Matter

Draw the diagram of a device which is used to decrease high ac voltage into a low ac voltage and state its working principle. Write four sources of energy loss in this device.

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Physics>Modern Physics>Dual Nature of Radiation and Matter>Wave Nature of Matter

Give reasons to explain the following:

(i) The core of the transformer is laminated.

(ii) Thick copper wire is used in windings.

MEDIUM

Physics>Modern Physics>Dual Nature of Radiation and Matter>Wave Nature of Matter

A proton and an electron have equal speeds. Find the ratio of de Broglie wavelengths associated with them.

EASY

Physics>Modern Physics>Dual Nature of Radiation and Matter>Wave Nature of Matter

What is the phenomenon involved in the working of transformer ?

HARD

Physics>Modern Physics>Dual Nature of Radiation and Matter>Wave Nature of Matter

Plot a graph showing variation of de Broglie wavelength

(λ)

associated with a charged particle of mass

m

, versus

\frac{1}{\sqrt{V}}

, where

V

is the potential difference through which the particle is accelerated. How does this graph gives us the information regarding the magnitude of the charge of the particle?

MEDIUM

Physics>Modern Physics>Dual Nature of Radiation and Matter>Wave Nature of Matter

A proton, a neutron, an electron and an