Alpha Question Bank for Medical: Chemistry>Chapter 2 - Structure of Atom>Exercise 4>Q 90

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Heat treatment of muscular pain involves radiation of wavelength of about $900 n m .$ Which spectral line of H-atom is suitable for this purpose?
$[R_{H} = 1 \times 10^{5} {cm}^{- 1}, h = 6 .6 \times 10^{- 34} Js, c = 3 \times 10^{8} {ms}^{- 1}]$

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Important Questions on Structure of Atom

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Alpha Question Bank for Medical: Chemistry>Chapter 2 - Structure of Atom>Exercise 4>Q 91

If the de Broglie wavelength of electron in nth Bohr orbit in hydrogenic atom is equal to

1.5 π a_{0}

(

a_{0}

is Bohr radius), then the value of n/Z is

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Alpha Question Bank for Medical: Chemistry>Chapter 2 - Structure of Atom>Exercise 5>Q 2

A

5 g

orbital has

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Alpha Question Bank for Medical: Chemistry>Chapter 2 - Structure of Atom>Exercise 5>Q 3

The threshold wavelength

(λ_{0})

of sodium metal is

6500 Å .

If

UV

light of wavelength

360 Å

is used, what will be the kinetic energy of the photoelectron in

ergs

?

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Alpha Question Bank for Medical: Chemistry>Chapter 2 - Structure of Atom>Exercise 5>Q 4

An electron beam can undergo diffraction by crystals. Through what potential should a beam of electrons be accelerated, so that its wavelength becomes equal to

1.54 \overset{°}{A}

?

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Alpha Question Bank for Medical: Chemistry>Chapter 2 - Structure of Atom>Exercise 5>Q 5

Radiation corresponding to the transition

n = 4

to

n = 2

in hydrogen atoms falls on a certain metal (work function

= 2.5 eV) .

The maximum kinetic energy of the photo-electrons will be:

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Alpha Question Bank for Medical: Chemistry>Chapter 2 - Structure of Atom>Exercise 5>Q 6

Calculate the number of photons emitted by a

100 W

yellow lamp in

1.0 s .

Take the wavelength of yellow light as

560 nm

and assume

100

%

efficiency.

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Alpha Question Bank for Medical: Chemistry>Chapter 2 - Structure of Atom>Exercise 5>Q 7

In a photoelectric experiment, the kinetic energy of photoelectrons was plotted against the frequency of incident radiation $(v)$ , as shown in the figure. Which of the following statements is correct?

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Alpha Question Bank for Medical: Chemistry>Chapter 2 - Structure of Atom>Exercise 5>Q 9

A sample of hydrogen (in the form of atoms), is made to absorb white light.

52 %

of the hydrogen atoms got ionised. In order to calculate the ionisation energy of hydrogen from its absorption spectrum (assuming the electrons that got ejected have

K E = 0),

it is possible by measuring the frequency of which of the following?