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प्रश्न
Choose the correct option.
The EM wave emitted by the Sun and responsible for heating the Earth’s atmosphere due to greenhouse effect is
विकल्प
Infra-red radiation
X-ray
Microwave
Visible light
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उत्तर
Infra-red radiation
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संबंधित प्रश्न
What role dose infra-red radiation play in maintain the Earth’s warmth
The terminology of different parts of the electromagnetic spectrum is given in the text. Use the formula E = hv (for energy of a quantum of radiation: photon) and obtain the photon energy in units of eV for different parts of the electromagnetic spectrum. In what way are the different scales of photon energies that you obtain related to the sources of electromagnetic radiation?
Give a reason for the following:
Long-distance radio broadcasts use short-wave bands. Why?
Name the phenomenon which shows the quantum nature of electromagnetic radiation.
Name the high energetic invisible electromagnetic waves which help in the study of the structure of crystals
What is the range of the wavelength of the following electromagnetic waves?
(a) Gamma rays.
Name the radiations of wavelength shorter than 4 × 10−7 m.
Name two electromagnetic waves of frequency smaller than that of violet light. State one use of each.
Name the rays or waves of highest frequency .
An electromagnetic wave has a frequency of 500 MHz and a wavelength of 60 cm Calculate the velocity of the wave.
Can a hydrogen atom emit characteristic X-rays?
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?
Visible light passing through a circular hole forms a diffraction disc of radius 0.1 mm on a screen. If an X-ray is passed through the same setup, the radius of the diffraction disc will be
The energy of a silver atom with a vacancy in K shell is 25.31 keV, in L shell is 3.56 keV and in M shell is 0.530 keV higher than the energy of the atom with no vacancy. Find the frequency of Kα, Kβ and Lα X-rays of silver.
(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 Microwaves
Name the scientist who discovered Infra-red waves
How will you investigate the existence of the radiation beyond the red and violet extremes of the spectrum?
What are the ultraviolet rays?
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.
Calculate the wavelength of a microwave of a frequency of 8.0 GHz.
All components of the electromagnetic spectrum in a vacuum have the same ______
The ratio of contributions made by the electric field and magnetic field components to the intensity of an EM wave is ______.
Why does microwave oven heats up a food item containing water molecules most efficiently?
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.
Write two uses of the following radiation.
Gamma rays
Given below in the left column are different modes of communication using the kinds of waves given in the right column.
| A. | Optical Fibre Communication |
P. | Ultrasound |
| B. | Radar | Q. | Infrared Light |
| C. | Sonar | R. | Microwaves |
| D. | Mobile Phones | S. | Radio Waves |
From the options given below, find the most appropriate match between entries in the left and the right column.
Which is the correct ascending order of wavelengths?
Photons of an electromagnetic radiation has an energy 11 keV each. To which region of electromagnetic spectrum does it belong?
Name two electromagnetic waves of wavelength smaller than that of violet light.
