12th Class PHYSICS Chapter No.9 ATOMIC SPECTRA Test No.2

Photon emitted in inner shell transition are:

Production of X-Rays can be regarded as the inverse of:

Accroding to uncertainity principle, for hydrogen atom of radius 5 x 10 -11 m, the speed of electron is:

Which of the following is the energy required (in ev)for ionizing an excited hydrogen atom?

Helium-neon laser, discharge tube contains helium:

The relation of paschen series is given as:

Which of the following is the ratio of K.E. to the P.E of the electron in any Bohr orbit of hydrogen atom?

The most common type of lasers used in physics laboratries are:

In Helium-neon laser, laser light generated has the colour:

Which of the following series of hydrogen spectrum lies in ultra violet region

Which is not characteristic of Laser:

If electron in hydrogen atom jumps from third orbit to second orbit the emitted radiation has wavelength (R is Rydberg's constant):

In Laser beam, all the photons:

Which of the following is the relation between energy (E) and momentum (P) of a photon?

X-Rays are maximum absorbed by:

Helium-neon laser, discharge tube contains neon:

The following gas was identified in the sun using spectoscopy:

In electronic transition , atom cannot emit:

Production of X-Rays is the reverse process of:

Population inversion is sustained in the neon gas relative to an energy level of:

The maximum uncertainity in the measurement of positron of an electron inside the nucleus is of the order of:

The size of the nucleus of an atom (i.e. diameter of the nucleus) is the order of:

The excited states in which the life time of an electron is of the order of 10-3 sec are called:

The dimensions of Planck's Constant is same as that of:

When electron jumps from fourth orbit to the second orbit, one gets the:

In Helium-neon laser, generated red light laser has the wavelength:

Which of the following is the value of principle quantum number of an ionized atom

Balmer Series lies in:

Helium and neon have nearly identical:

When electron in hydrogen atoms jumps from the second orbit to the first orbit, the wavelength of the emitted radiation is ? which of the following will be the wavelength of emitted radiation when electron jump from third to first orbit?

Atom can reside in metastable state for:

With increasing quantum number the energy difference between in adjacent levels in atoms:

In an X-Ray tube, the intensity of emitted X-Rays beam is increased by:

If electron jumps from second orbit to first orbit in hydrogen atom it emots photon of:

Hydrogen atom does not emit X-Rays because

Laser emitted by laser device has:

Laser can only be produced if an atom is in its:

Which of the following is the ratio of the energies of hydrogen atom in its first to second exceited state?

In discharge tube, electricity is conducted by:

Balmer series lies in:

Production of X-Rays can be regarded as the inverse of:

The life time of meta stable is:

Which of the following is the frequency of the series limit of Balmer series of hydrogen atom in terms of Rydberg constant R and velocity of Light C?

The meta stable state of Helium is nearly at:

Gases begin to conduct electricity at low pressure because:

Laser principle are of _____________ kinds

Which of the following is the energy required to remove an electron from the second orbit of hydrogen atom? (ionization potential of H. atom =13.6v)

The incident photon is absorbed by an atom in the ground state (E1) thereby leaving the atom in the excited state (E2) is called:

The equation of Rydberg constant is given by:

Laser beam can be used to generate three dimensional images of objects in a process called:

The radius of hydrogen atom is about:

The radius of first Bohr orbit in hydrogen atom is:

In a electronic transition atom cannot emit:

K? -Rays are produced due to tranistion of electrons from:

If V is accelerating voltage then which of the following will be the maximum frequency of emitted X-Rays form X-Rays tube?

Laser has use in:

In X-Rays tube the accelerating potential appllied at the anode is V0. Which of the following will be the minimum wavelength of the emitted x-rays?

Production of X-Rays is the reverse process of:

The intensity of X-Rays from a Coolidge tube is plotted against wavelength ? as shown in the figure. The minimum wavelength found is ?c and the wavelength of the K? line is ?k As The accelerating voltage is increased:

The speed of electron in the nth orbit is given as:

The ratio of minimum to maximum wavelength in Balmer's series is:

In hydrogen atom electron jumps from the first orbit to second orbit, its radius

Life time of excited states (meta stable) is:

Laser is the acronym of:

Life of meta stable of most atoms is about:

The shortest wavelength of X-Rays emitted from X-Rays tube depends on the:

If V1 is the speed of electron in first orbit of hydrogen atom then velocity of the electron in 4th orbit will be Rydberg constant R and velocity of light C?

The maximum number of electrons in the Bohr orbit can be

Laser can be made by creating:

The radius of 10th orbit in hydrogen atom is:

Helium-neon laser discharge tube contains neon:

Which of the following is the dimensional formula of Rydberg's constant

The life time of most excited state atoms is about:

Electrons of mass m and charge e are accelerated through a potential difference V and strike the target of ray tube. Which of the following is the maximum speed of these electrons?

The value of Rydberg's Constant is:

A potential difference of 42000 V is used in an X-Rays tube to acclerate electrons. Which of the following is the maximum frequency of the emitted x-rays?

In helium-Neon laser, discharge tube is filled with Neon gas:

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

The common door bell requires a voltage of about:

The value of radius of 1st Bohr's orbit:

Balmer Series lies in:

The meta stable state of neon is nearly at:

Hydrogen atom spectrum does not lie in:

An electron can never by found:

For pair production, minimum energy of photon must be:

The difference between soft and hard x-rays is of:

Atom is nearly:

In Helium-neon laser, red laser light has energy:

Emission of photon of energy hf = E2-E1 in any arbitrary direction is:

Meta stable state is:

In three phase voltage across any two lines is a:

For which of the following transition infrared radiation will be obtained:

An excited atom can reside in a meta stable state for:

Which of the following is the K.E of electron that is is accelerated through a potential of 100v

Laser is a beam of light, which is: