Advertisements
Advertisements
Questions
Name two sources of ultraviolet radiation.
State any one source of ultraviolet radiation.
Advertisements
Solution
- Sun
- Electric arc
- Mercury lamp
- Halogen lamp
Notes
Students should refer to the answer according to their questions.
APPEARS IN
RELATED QUESTIONS
A wave has wavelength 50 Å.
- Name the wave.
- State its speed in vacuum.
- State its one use.
What do you understand by the statement, "Electromagnetic waves transport momentum"?
Give the range of wavelength of the electromagnetic waves visible to us.
Name the waves used for taking photographs in dark.
One of the following wavelengths is absent and the rest are present in the X-rays coming from a Coolidge tube. Which one is the absent wavelength?
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.
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 X-ray coming from a Coolidge tube has a cutoff wavelength of 80 pm. Find the kinetic energy of the electrons hitting the target.
(Use Planck constant h = 6.63 × 10-34 Js= 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 Visible light
Name the scientist who discovered Ultraviolet rays
Name the radiation which can be detected by thermopile.
Name the part of the electromagnetic spectrum which is:
Produced by bombarding a metal target with high electrons.
Define the term "Intensity" in the photon picture of electromagnetic radiation.
Name the radiation of the electromagnetic spectrum which is used for the following:
To photograph internal parts of the human body and Give the frequency range
Name any two electromagnetic waves which have a frequency higher than that of violet light. State one use of each.
Give one use of electromagnetic radiation in Ultraviolet radiation.
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.
The area to be covered for T.V telecast is doubled then the height of transmitting antenna (T.V tower) will have to be:-
Give any two uses of infrared waves.
