Advertisements
Advertisements
प्रश्न
Name two sources of ultraviolet radiation.
State any one source of ultraviolet radiation.
Advertisements
उत्तर
- Sun
- Electric arc
- Mercury lamp
- Halogen lamp
Notes
Students should refer to the answer according to their questions.
APPEARS IN
संबंधित प्रश्न
To which part of electromagnetic spectrum does a wave of frequency 3 × 1013 Hz belong?
To which part of the electromagnetic spectrum does a wave of frequency 5 × 1011 Hz belong?
What do you understand by the statement, "Electromagnetic waves transport momentum"?
What is the range of the wavelength of the following electromagnetic waves?
(a) Micro waves .
What is the range of the wavelength of the following electromagnetic waves?
(A) Radio waves.
An X-ray beam can be deflected
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.)
The Kα and Kβ X-rays of molybdenum have wavelengths 0.71 A and 0.63 A respectively. Find the wavelength of Lα X-ray of molybdenum.
(Use Planck constant h = 6.63 × 10-34 Js= 4.14 × 10-15 eVs, speed of light c = 3 × 108 m/s.)
Identify the part of the electromagnetic spectrum used in (i) radar and (ii) eye surgery. Write their frequency range.
What is the wavelength of the wave whose frequency is 1012 Hz? Name the electromagnetic wave.
Solve the numerical problem.
The speed of light is 3 × 108 m/s. Calculate the frequency of red light of a wavelength of 6.5 × 10−7 m.
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:-
The area to be covered for T.V telecast is doubled then the height of transmitting antenna (T.V tower) will have to be:-
Electromagnetic waves with wavelength
- λ1 is used in satellite communication.
- λ2 is used to kill germs in water purifies.
- λ3 is used to detect leakage of oil in underground pipelines.
- λ4 is used to improve visibility in runways during fog and mist conditions.
- Identify and name the part of electromagnetic spectrum to which these radiations belong.
- Arrange these wavelengths in ascending order of their magnitude.
- Write one more application of each.
Arrange the following electromagnetic radiation in the ascending order of their frequencies:
X-rays, microwaves, gamma rays, radio waves
Electromagnetic waves of wavelengths λ1, λ2 and λ3 are used in a radar system, in water purifiers and in remote switches of TV, respectively.
- Identify the electromagnetic waves.
- Write one source for each of them.
Identify the electromagnetic radiation and write its wavelength range, which is used to kill germs in water purified. Name the two sources of these radiations.
Where do ultraviolet rays lie relative to visible light?
Which are uses of gamma rays?
