Question # 1

Helium Neon Laser Beam emitted from discharge tube has a colour.

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Blue

Green

Red

Black

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

The radius of hydrogen atom is:

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0.53A°

0.053A°

0.53 x 10^-9

0.053 x10^-9

The process by which lesser beam can be used to generate 3-dimensional images of objects is called

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Holography

Geo graphy

Tomography

Radio graphy

Frequency of x-rays depends upon.

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Number of electrons striking target

Accelerating potencial

Nature of the target

Both B and C

We can find from de Broglie formula

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Wavelength

Amplitude

Speed of wave

Frequency of wave

The radius of 10th orbit in hydrogen atom is.

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0.053 nm

0.53 nm

5.3 nm

53 nm

For Paschen series, the value of 'n' starts from

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2

4

6

8

_____ has the largest de Broglie wavelength at same speed.

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Proton

Alpha particle

Carbon atom

Electron

Charge on positron is:

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Negative

Positive

Netural

None of these

Hydrogen atom spectrum does not lie in

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Ultraviolet region

Visible region

Infrared region

X ray region

Electron volt is unit of:

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Chemical energy

Potential energy

Nuclear energy

heat energy

The longest wavelength of Paschen series is.

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656 nm

1094 nm

1875 nm

2000 nm

A° is the unit of:

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Energy

Length

Nuclear energy

Work

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Physics Fsc Part 2 Chapter 9 Online Test MCQs With Answers

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