Advertisements
Advertisements
प्रश्न
Can a hydrogen atom emit characteristic X-rays?
Advertisements
उत्तर
The difference of energy levels in a hydrogen atom is small. Hence, it is not able to emit characteristic X-rays.
APPEARS IN
संबंधित प्रश्न
Name the parts of the electromagnetic spectrum which is
used as a diagnostic tool in medicine.
Write in brief, how these waves can be produced.
Optical and radio telescopes are built on the ground but X-ray astronomy is possible only from satellites orbiting the earth. Why?
State Moseley's law
Name the region beyond the violet end of the spectrum called.
The wavelength of X-rays is 0.01 Å. Calculate its frequency. State the assumption made, if any.
Can Lα X-ray of one material have shorter wavelength than Kα X-ray of another?
X-ray from a Coolidge tube is incident on a thin aluminium foil. The intensity of the X-ray transmitted by the foil is found to be I0. The heating current is increased to increase the temperature of the filament. The intensity of the X-ray transmitted by the foil will be
(a) zero
(b) < I0
(c) I0
(d) > I0
Cutoff wavelength of X-rays coming from a Coolidge tube depends on the
(a) target material
(b) accelerating voltage
(c) separation between the target and the filament
(d) temperature of the filament.
X-ray incident on a material
(a) exerts a force on it
(b) transfers energy to it
(c) transfers momentum to it
(d) transfers impulse to it.
Find the energy, the frequency and the momentum of an X-ray photon of wavelength 0.10 nm.
(Use Planck constant h = 4.14 × 10-15 eVs, speed of light c = 3 × 108 m/s.)
Find the maximum potential difference which may be applied across an X-ray tube with tungsten target without emitting any characteristic K or L X-ray. The energy levels of the tungsten atom with an electron knocked out are as follows.
| Cell containing vacancy | K | L | M |
| Energy in keV | 69.5 | 11.3 | 2.3 |
Name the scientist who discovered Microwaves
State two uses of infrared radiations.
Answer briefly.
Does an ordinary electric lamp emit EM waves?
Answer briefly.
Why light waves travel in a vacuum whereas sound waves cannot?
Find the photon energy in units of ev for electromagnetic wave if waves length 40 m. Given h = 6.63 × 10–34 J.
Why does microwave oven heats up a food item containing water molecules most efficiently?
Name two electromagnetic waves of wavelength smaller than that of violet light.
