Advertisements
Advertisements
प्रश्न
Answer briefly.
Does an ordinary electric lamp emit EM waves?
Advertisements
उत्तर
Yes, an ordinary electric lamp emits EM waves.
APPEARS IN
संबंधित प्रश्न
What role dose infra-red radiation play in physical therapy?
Name the electromagnetic radiations used for (a) water purification, and (b) eye surgery.
Name the subjective property of light related to its wavelength.
A wave has a wavelength of 10-3 nm. Name the wave.
Give one use of gamma rays.
Name the waves produced by the changes in the nucleus of an atom.
When a Coolidge tube is operated for some time it becomes hot. Where does the heat come from?
X-ray and visible light travel at the same speed in vacuum. Do they travel at the same speed in glass?
Is it possible that in a Coolidge tube characteristic Lα X-rays are emitted but not Kα X-rays?
Why is exposure to X-rays injurious to health but not exposure to visible light, when both are electromagnetic waves?
The energy of a photon of a characteristic X-ray from a Coolidge tube comes from
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.
Mark the correct options.
(a) An atom with a vacancy has smaller energy that a neutral atom.
(b) K X-ray is emitted when a hole makes a jump from the K shell to some other shell.
(c) The wavelength of K X-ray is smaller than the wavelength of L X-ray of the same material.
(d) The wavelength of Kα X-ray is smaller than the wavelength of Kβ X-ray of the same material.
The potential difference applied to an X-ray tube is increased. As a result, in the emitted radiation,
(a) the intensity increases
(b) the minimum wavelength increases
(c) the intensity remains unchanged
(d) the minimum wavelength decreases.
Consider a photon of continuous X-ray and a photon of characteristic X-ray of the same wavelength. Which of the following is/are different for the two photons?
The wavelength of Kα X-ray of tungsten is 21.3 pm. It takes 11.3 keV to knock out an electron from the L shell of a tungsten atom. What should be the minimum accelerating voltage across an X-ray tube having tungsten target which allows production of Kα X-ray?
(Use Planck constant h = 6.63 × 10-34 Js= 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.)
Name the scientist who discovered Ultraviolet rays
Name three radiations and their wavelength range which are invisible and beyond the violet end of the visible spectrum.
Define the term "Intensity" in the photon picture of electromagnetic radiation.
Give one use of electromagnetic radiation in Microwaves.
Answer briefly.
Why light waves travel in a vacuum whereas sound waves cannot?
X-rays, gamma rays and microwaves travelling in a vacuum have ______.
The frequency of x-rays, y-rays and ultraviolet rays are respectively a, b and c. Then:-
Following QN ∴ 14, the radiation force on the roof will be
The ratio of contributions made by the electric field and magnetic field components to the intensity of an EM wave is ______.
Write two uses of the following radiation.
X-rays
Which is the correct ascending order of wavelengths?
