Question # 1

The shortest wave length is Bracket series has wave length.

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16/Rn

Rn/16

16 Rn

4 Rn

Helium-Neon laser discharge tube contains neon

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82%

15%

25%

85%

Radius of first Bohr's orbit is.

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0.053 nm

0.053 mm

0.053 micro meter

0.053 m

When meta I is heated sufficiently electrons are given off by the metal. This phenomenon is known as.

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Photoelectric effect

Piezo electric effect

Thermionic emission

Secondary emission

A° is the unit of:

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Energy

Length

Nuclear energy

Work

The velocity of electron moving is 1st orbit of hydrogen atom is:

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2.09 x 10⁶ ms^-1

2.18 x10⁶ ms^-1

2.19 x 10⁶ ms^-1

3.18 x10⁶ ms^-1

Target material used in x-rays tube have following properties.

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High atomic number and high melting pouint

High atomic number and low melting pouint

Low atomic number and low melting pouint

High atomic number only

Study of hydrogen visible spectrum in

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1886

1887

1895

1885

Boher proposed his atomic model in:

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1910

1911

1912

1913

The radius of 10th orbit in hydrogen atom is.

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0.053 nm

0.53 nm

5.3 nm

53 nm

Which series lies in the ultraviolet region.

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Balmer series

Bracket series

Ptund series

Lyman series

Electron volt is unit of:

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Chemical energy

Potential energy

Nuclear energy

heat energy

1 rad =

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0.001Gy

0.01Gy

0.1Gy

1.01Gy

The line radiations emitted from by hydrogen filled discharge tube can be analyzed into.

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Band spectrum

Line spectrum

Continuous spectrum

Absorption spectrum

When an electron in an atom goes from a lower to higher orbit its:

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K.E increases , P.E decreases

K.E increases , P.E increases

K.E decreases , P.E increases

K.E decreases , P.E decreases

The value of Rydberg constant is

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1.0974 x 10⁷ m^-1

1.0974 x 10^-7 m^-1

1.0974 x 10⁶ m^-1

1.0974 x 10^-6 m^-1

Kx -Xrays are produced due to transition of electron from.

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K to L shell

L to K shell

M to K shell

M to L shell

In according with Bohr's theory the K.E of the electron is equal to:

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ke²/2r

Ze²/r

Ze²/r²

Ze²/2r²

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