English
Karnataka Board PUCPUC Science 2nd PUC Class 12

The Small Ozone Layer on Top of the Stratosphere is Crucial for Human Survival. Why?

Advertisements
Advertisements

Question

The small ozone layer on top of the stratosphere is crucial for human survival. Why?

Short/Brief Note
Advertisements

Solution

The small ozone layer on the top of the atmosphere is crucial for human survival because it absorbs harmful ultraviolet radiations present in sunlight and prevents it from reaching the Earth’s surface.

shaalaa.com
  Is there an error in this question or solution?
Chapter 8: Electromagnetic Waves - Exercise [Page 287]

APPEARS IN

NCERT Physics Part I and II [English] Class 12
Chapter 8 Electromagnetic Waves
Exercise | Q 8.15 (d) | Page 287

Video TutorialsVIEW ALL [2]

RELATED QUESTIONS

Why are microwaves considered suitable for radar systems used in aircraft navigation?


A plane electromagnetic wave travels in the vacuum along the z-direction. What can you say about the directions of its electric and magnetic field vectors? If the frequency of the wave is 30 MHz, what is its wavelength?


Why are infra-red waves often called heat waves? Explain.


Which radiation is used for satellite communication?


What is the range of the wavelength of the following electromagnetic waves?
(a) Gamma rays.


What is the range of the wavelength of the following electromagnetic waves?

(a) Micro waves .


Why is exposure to X-rays injurious to health but not exposure to visible light, when both are electromagnetic waves?


50% of the X-ray coming from a Coolidge tube is able to pass through a 0.1 mm thick aluminium foil. The potential difference between the target and the filament is increased. The thickness of the aluminium foil that will allow 50% of the X-ray to pass through will be


X-ray from a Coolidge tube is incident on a thin aluminium foil. The intensity of the X-ray transmitted by the foil is found to be I0. The heating current is increased to increase the temperature of the filament. The intensity of the X-ray transmitted by the foil will be
(a) zero
(b) < I0
(c) I0
(d) > I0


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.)


The distance between the cathode (filament) and the target in an X-ray tube is 1.5 m. If the cutoff wavelength is 30 pm, find the electric field between the cathode and the target.

(Use Planck constant h = 6.63 × 10-34 Js= 4.14 × 10-15 eVs, speed of light c = 3 × 108 m/s.)


Name the radiation which can be detected by thermopile.


Choose the correct option.

Earth’s atmosphere is richest in


Solve the numerical problem.

Calculate the frequency in MHz of a radio wave of wavelength 250 m. Remember that the speed of all EM waves in a vacuum is 3.0 × 108 m/s.


Microwaves are electromagnetic waves with frequency in the range of.


Following QN ∴ 14, the radiation force on the roof will be


The area to be covered for T.V telecast is doubled then the height of transmitting antenna (T.V tower) will have to be:-


In uranium (Z = 92) the K absorption edge is 0.107 Å and the Kα line is 0.126 Å, and the wavelength of the L absorption edge is ______.


Name one radiation having the wavelength longer than the wavelength of these radiations.


What happens when an electron collides with a positron?


Share
Notifications

Englishहिंदीमराठी


      Forgot password?
Use app×