An Xray tube operating at 50kV converts 1% energy in the form of Xray. 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.
Number of electrons colliding with the target per second is :
The correct answer is: 6.25
In a hydrogen atom following Bohr's postulates, the product of linear momentum and angular momentum is proportional to (n)^{x} where n is the orbit number. Then x is
Linear momentum ⇒
Angular momentum ⇒
∴ Product of linear momentum and angular momentum ∝ n^{0}.
The correct answer is: 0
Work function for aluminum metal is 4.125 eV. For photo electric effect from aluminum metal, the cut off wavelength (in nm) will be.
The correct answer is: 300
If the short wavelength limit of the continuous spectrum coming out of a coolidge tube is 10Å, then the deBroglie wavelength (in Å)of the electrons reaching the largest metal in the coolidge tube is approximately.
The correct answer is: 0.3
Yellow light of 557 nm wavelength is incident on a cesium surface. It is found that no photoelectron flow in the circuit when the cathode anode voltage drops below 0.25V. Then the threshold wavelength (in nm) for photoelectric effect from cesium is.
⇒
The correct answer is: 625
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 photoelectron will be.
The correct answer is: 0.58
The ratio of deBroglie wavelength of a proton and an αparticle accelerated through the same potential difference is:
⇒
The correct answer is: 2.828
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.
Number of photon/second
Number of photon electron emitted/second by 1 photon = N/100
Photo electric current
The correct answer is: 0.4
The wavelength of L_{n} line in Xrays spectrum of _{78}Pt is 1.32 Å. The wavelength of L_{n} line in Xrays spectrum of another unknown element is 4.17Å. If screening constant for L_{a} line is 7.4, then atomic number of the unknown element is :
The correct answer is: 47
The intensity of an Xray 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 :
The correct answer is: 200
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