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

The meta stable state of neon is nearly at:

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

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

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

The equation of Rydberg constant is given by:

The radius of 10th orbit in hydrogen atom is:

Balmer Series lies in:

In a electronic transition atom cannot emit:

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

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

Photon emitted in inner shell transition are:

Laser can be made by creating:

In discharge tube, electricity is conducted by:

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?

The life time of meta stable is:

An electron can never by found:

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

Hydrogen atom spectrum does not lie in:

The meta stable state of Helium is nearly at:

For pair production, minimum energy of photon must be:

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

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

Helium and neon have nearly identical:

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

The common door bell requires a voltage of about:

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

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

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

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

Laser is the acronym of:

In three phase voltage across any two lines is a:

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

In electronic transition , atom cannot emit:

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

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

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

Production of X-Rays is the reverse process of:

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

X-Rays are maximum absorbed by:

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?

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)

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 most common type of lasers used in physics laboratries are:

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

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

The following gas was identified in the sun using spectoscopy:

Laser principle are of _____________ kinds

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

Laser emitted by laser device has:

In Laser beam, all the photons:

The maximum number of electrons in the Bohr orbit can be

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?

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

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

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

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

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

Laser is a beam of light, which is:

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

The radius of hydrogen atom is about:

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

Balmer series lies in:

Balmer Series lies in:

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

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

Hydrogen atom does not emit X-Rays because

Helium-neon laser discharge tube contains neon:

Production of X-Rays is the reverse process of:

Gases begin to conduct electricity at low pressure because:

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

Life time of excited states (meta stable) is:

The relation of paschen series is given as:

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

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

Meta stable state is:

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

Atom can reside in metastable state for:

Helium-neon laser, discharge tube contains helium:

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

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

Helium-neon laser, discharge tube contains neon:

The life time of most excited state atoms is about:

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

The radius of first Bohr orbit in hydrogen atom is:

Laser has use in:

Which is not characteristic of Laser:

Life of meta stable of most atoms is about:

Atom is nearly:

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

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

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?

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?

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