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प्रश्न
Choose the correct option.
Earth’s atmosphere is richest in
पर्याय
UV
IR
X-ray
Microwaves
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उत्तर
Earth’s atmosphere is richest in IR
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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?
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?
If the earth did not have an atmosphere, would its average surface temperature be higher or lower than what it is now?
Name the phenomenon which shows the quantum nature of electromagnetic radiation.
What is the range of the wavelength of the following electromagnetic waves?
(a) Ultraviolet
What is the range of the wavelength of the following electromagnetic waves?
(A) Radio waves.
What do you understand by the invisible spectrum?
Name two electromagnetic waves of frequency smaller than that of violet light. State one use of each.
Name the waves used for taking photographs in dark.
Moseley's Law for characteristic X-ray is √v = a(Z − b). Here,
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 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.
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.)
The stopping potential in a photoelectric experiment is linearly related to the inverse of the wavelength (1/λ) of the light falling on the cathode. The potential difference applied across an X-ray tube is linearly related to the inverse of the cutoff wavelength (1/λ) of the X-ray emitted. Show that the slopes of the lines in the two cases are equal and find its value.
(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
X-rays
Calculate the shortest wavelength of electromagnetic radiation present in Balmer series of hydrogen spectrum.
Identify the part of the electromagnetic spectrum used in (i) radar and (ii) eye surgery. Write their frequency range.
Identify the part of the electromagnetic spectrum used in
(i) radar and
(ii) eye surgery. Write their frequency range.
Name any two electromagnetic waves which have a frequency higher than that of violet light. State one use of each.
State three properties of ultra-violet radiation similar to visible light.
Give one use of electromagnetic radiation in Microwaves.
Answer briefly.
What is a carrier wave?
An e.m. wave exerts pressure on the surface on which it is incident. Justify.
A bat moving at 10 ms−1 towards a wall sends a sound signal of 8000 Hz towards it. On reflection, it hears a sound of frequency f The value of f in Hz is close to (speed of sound = 320 ms−1)
The frequency of x-rays, y-rays and ultraviolet rays are respectively a, b and c. Then:-
The frequency of e. m waves which is best suited .to observed of radius 3 × 10–4 his of the order of
A radio can tune to any station in the 7.5 mHz to 12 MHz band. What is corresponding wave length band.
One requires 11eV of energy to dissociate a carbon monoxide molecule into carbon and oxygen atoms. The minimum frequency of the appropriate electromagnetic radiation to achieve the dissociation lies in ______.
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.
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.
