Advertisements
Advertisements
प्रश्न
How are infrared waves produced?
Advertisements
उत्तर
Infrared waves are adjacent to the low-frequency or long-wavelength end of the visible spectrum. They are produced by hot bodies and molecules.
APPEARS IN
संबंधित प्रश्न
A radio can tune in to any station in the 7.5 MHz to 12 MHz band. What is the corresponding wavelength band?
Name two sources, each of infrared radiations and ultraviolet radiations.
The X-ray beam emerging from an X-ray tube
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
Find the cutoff wavelength for the continuous X-rays coming from an X-ray tube operating at 30 kV.
(Use Planck constant h = 4.14 × 10-15 eVs, speed of light c = 3 × 108 m/s.)
Continuous X-rays are made to strike a tissue paper soaked with polluted water. The incoming X-rays excite the atoms of the sample by knocking out the electrons from the inner shells. Characteristic X-rays are analysed and the intensity is plotted against the wavelength. Assuming that only Kα intensities are detected, list the elements present in the sample from the plot. Use Moseley's equation v − (25 × 1014Hz)(Z − 1)2.
(Use Planck constant h = 6.63 × 10-34 Js= 4.14 × 10-15 eVs, speed of light c = 3 × 108 m/s.)
-
- Calculate the speed of the wave.
- Name the medium through which it is traveling.
State the name and the range of wavelength of the invisible electromagnetic waves beyond the red end of the visible spectrum.
State three properties of ultra-violet radiation similar to visible light.
Answer briefly.
What is a carrier wave?
