Advertisements
Advertisements
Question
Can a hydrogen atom emit characteristic X-rays?
Advertisements
Solution
The difference of energy levels in a hydrogen atom is small. Hence, it is not able to emit characteristic X-rays.
APPEARS IN
RELATED QUESTIONS
What role dose infra-red radiation play in maintain the Earth’s warmth
To which part of the electromagnetic spectrum does a wave of frequency 5 × 1011 Hz belong?
The small ozone layer on top of the stratosphere is crucial for human survival. Why?
The wavelengths for the light of red and blue colours are roughly 7.8 × `10^7` m and 4.8 × `10^7` m respectively.
(a) Which colour has the greater speed in vacuum?
(b) Which colour has the greater speed in glass?
Name the radiations of wavelength just shorter than 4 × 10-7 m.
Name the waves used for taking photographs in dark.
When a Coolidge tube is operated for some time it becomes hot. Where does the heat come from?
The X-ray beam emerging from an X-ray tube
For harder X-rays,
(a) the wavelength is higher
(b) the intensity is higher
(c) the frequency is higher
(d) the photon energy is higher.
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.
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 |
An X-ray tube operates at 40 kV. Suppose the electron converts 70% of its energy into a photon at each collision. Find the lowest there wavelengths emitted from the tube. Neglect the energy imparted to the atom with which the electron collides.
(Use Planck constant h = 6.63 × 10-34 Js= 4.14 × 10-15 eVs, speed of light c = 3 × 108 m/s.)
A free atom of iron emits Kα X-rays of energy 6.4 keV. Calculate the recoil kinetic energy of the atom. Mass of an iron atom = 9.3 × 10−26 kg.
(Use Planck constant h = 6.63 × 10-34 Js= 4.14 × 10-15 eVs, speed of light c = 3 × 108 m/s.)
Name the part of the electromagnetic spectrum which is:
Produced by bombarding a metal target with high electrons.
State two properties of infrared radiations which differ from visible light.
Name the radiations used for the detection of fracture in bones.
If the Earth did not have atmosphere, would its average surface temperature be higher or lower than what it is now? Explain.
Identify the electromagnetic wave whose wavelength range is from about 10-3 m to about 10-1 m. Write one use of this.
Name two electromagnetic waves of wavelength smaller than that of violet light.
