NEET Physics: Questions 1149 - 1153 of 2099
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Read the passage given below and answer the questions that follow:
A gas of identical hydrogen like atoms has some atoms in ground state and some atoms in a particular excited state and there are no atoms in any other energy level. The atoms of the gas make transition to a higher energy state by absorbing monochromatic light of wavelength 304 Å. Subsequently, the atoms emit radiation of only six different photon energies. Some of emitted photons have wavelength 304 Å, some have wavelength more and some have less than 304 Å (Take h c = 12420 eV- Å)
Question number: 1149 (3 of 3 Based on Passage) Show Passage
Question number: 1150
An X-ray tube is operating at 100 kV. The minimum wavelength of X-ray and maximum velocity of the electrons striking the anti-cathode are,
0.098 Å, 1.658 × 10 8 m/s
0.124 Å, 1.875 × 10 8 m/s
0.322 Å, 3.624 × 10 8 m/s
0.226 Å, 2.875 × 10 8 m/s
Question number: 1151
Question number: 1152
The cloud in sky generally appears to be whitish.
Diffraction due to clouds is efficient in equal measure at all wavelengths.
|a.||Ꭺ is true but Ꭱ is false|
|b.||Both Ꭺ and Ꭱ are true and Ꭱ is the correct explanation of Ꭺ|
|c.||Both Ꭺ and Ꭱ are true but Ꭱ is NOT the correct explanation of Ꭺ|
|d.||Both Ꭺ and Ꭱ are false|
Question number: 1153
The absorbance of a perfect black body is unity.
A perfect black body when heated emits radiations of all possible wavelengths at that temperature.
|a.||Both Ꭺ and Ꭱ are true but Ꭱ is NOT the correct explanation of Ꭺ|
|b.||Ꭺ is true but Ꭱ is false|
|c.||Both Ꭺ and Ꭱ are false|
|d.||Ꭺ is false but Ꭱ is true|