English

Answer briefly. Name the most harmful radiation entering the Earth's atmosphere from outer space.

Advertisements
Advertisements

Question

Answer briefly.

Name the most harmful radiation entering the Earth's atmosphere from outer space.

One Line Answer
Advertisements

Solution

Name the most harmful radiation entering the Earth's atmosphere from outer space – Ultraviolet radiation

shaalaa.com
  Is there an error in this question or solution?
Chapter 13: Electromagnetic Waves and Communication System - Exercises [Page 241]

APPEARS IN

Balbharati Physics [English] Standard 11 Maharashtra State Board
Chapter 13 Electromagnetic Waves and Communication System
Exercises | Q 2. (x) | Page 241

Video TutorialsVIEW ALL [2]

RELATED QUESTIONS

What physical quantity is the same for X-rays of wavelength 10−10 m, red light of wavelength 6800 Å and radiowaves of wavelength 500 m?


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


Name the electromagnetic radiations used for (a) water purification, and (b) eye surgery.


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

(a) Micro waves .


Name the region beyond  the red end  of the spectrum.


Is it possible that in a Coolidge tube characteristic Lα X-rays are emitted but not Kα X-rays?


Can a hydrogen atom emit characteristic X-rays?


If the potential difference applied to the tube is doubled and the separation between the filament and the target is also doubled, the cutoff wavelength


If the current in the circuit for heating the filament is increased, the cutoff 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


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.


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 wavelengths of Kα and Lα X-rays of a material are 21.3 pm and 141 pm respectively. Find the wavelength of Kβ X-ray of the material.

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


When 40 kV is applied across an X-ray tube, X-ray is obtained with a maximum frequency of 9.7 × 1018 Hz. Calculate the value of Planck constant from these data.

(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


Name the scientist who discovered Microwaves 


What are ultraviolet radiations? How are they detected? State two properties and one use of ultraviolet radiations.

Name the part of the electromagnetic spectrum which is: 
Produced by bombarding a metal target with high electrons.


Calculate the shortest wavelength of electromagnetic radiation present in Balmer series of hydrogen spectrum.


Name the radiation of the electromagnetic spectrum which is used for the following:

For taking photographs of the sky during the night and foggy conditions . Give the frequency range


Gamma rays and radio waves travel with the same velocity in free space. Distinguish between them in terms of their origin and the main application.


What are the ultraviolet rays?


Ozone layer above the earth's atmosphere will


Electromagnetic waves of wavelengths λ1, λ2 and λ3 are used in a radar system, in water purifiers and in remote switches of TV, respectively.

  1. Identify the electromagnetic waves.
  2. Write one source for each of them.

Identify the electromagnetic wave whose wavelength range is from about 10-3 m to about 10-1 m. Write one use of this.


Assertion (A): Ultraviolet radiations is scattered more as compared to the microwave radiations.

Reason (R): Wavelength of ultraviolet radiation is more than the wavelength of microwave radiation.


Which devices commonly produce microwaves?


Where do ultraviolet rays lie relative to visible light?


Which set lists uses of ultraviolet rays?


Which electromagnetic radiation has the highest frequency and shortest wavelength?


Share
Notifications

Englishहिंदीमराठी


      Forgot password?
Use app×