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*Answer can only contain numeric values

QUESTION: 1

An *X*-ray tube operating at 50*kV* converts 1% energy in the form of *X*-ray. If the amount of heat produced is 495 *watts*, then the number of electrons colliding with the target per second is . Find the value of α.

Solution:

Number of electrons colliding with the target per second is :

The correct answer is: 6.25

*Answer can only contain numeric values

QUESTION: 2

In a hydrogen atom following the Bohr’s postulates the product of linear momentum and angular momentum is proportional to (** n**) is the orbit number. Then

Solution:

Linear momentum ⇒

Angular momentum ⇒

∴ Product of linear momentum and angular momentum ∝ n^{0}.

The correct answer is: 0

*Answer can only contain numeric values

QUESTION: 3

Work function for aluminum metal is 4.125 eV. For photo electric effect from aluminum metal, the cut off wavelength (in *nm*) will be.

Solution:

The correct answer is: 300

*Answer can only contain numeric values

QUESTION: 4

If the short wavelength limit of the continuous spectrum coming out of a coolidge tube is 10**Å**, then the de-Broglie wavelength (in **Å**)of the electrons reaching the largest metal in the coolidge tube is approximately.

Solution:

The correct answer is: 0.3

*Answer can only contain numeric values

QUESTION: 5

Yellow light of 557 *nm* wavelength is incident on a cesium surface. It is found that no photo-electron flow in the circuit when the cathode anode voltage drops below 0.25*V*. Then the threshold wavelength (in *nm*) for photoelectric effect from cesium is.

Solution:

⇒

The correct answer is: 625

*Answer can only contain numeric values

QUESTION: 6

Light of wavelength 5000Å falls on a sensitive plate with photoelectric work function of 1.9 eV. The kinetic energy (in eV) of the emitted photo-electron will be.

Solution:

The correct answer is: 0.58

*Answer can only contain numeric values

QUESTION: 7

The ratio of de-Broglie wavelength of a proton and an α-particle accelerated through the same potential difference is.

Solution:

⇒

The correct answer is: 2.828

*Answer can only contain numeric values

QUESTION: 8

When light of intensity 1 W/m^{2} and wavelength 5 × 10^{–7} m is incident on a surface, it is completely absorbed by the surface. If 100 photons emit one electron and area of the surface is 1 cm^{2}, then the photoelectric current (in µA) will be.

Solution:

Number of photon/second

Number of photon electron emitted/second by 1 photon = N/100

Photo electric current

The correct answer is: 0.4

*Answer can only contain numeric values

QUESTION: 9

The wavelength of *L _{n}* line in

Solution:

The correct answer is: 47

*Answer can only contain numeric values

QUESTION: 10

The intensity of an X-ray beam reduces to 36.8% of its initial intensity after traversing a gold film of thickness 5 × 10^{–3} m. Its absorption coefficient (in m^{–1}) is :

Solution:

The correct answer is: 200

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