Tag: properties and uses of different radiation

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Multiple choice physics electromagnetic waves properties and uses of different radiation electromagnetic spectrum spectrum

A wave has wavelength $50A^o$. State the speed of wave in vacuum.

  1. $3\times 10^8ms^{-1}$

  2. >$3\times 10^8ms^{-1}$

  3. <$3\times 10^8ms^{-1}$

  4. Insufficient information
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

X-rays has a wavelength of $50\ A^o$.
All electromagnetic radiation, of which radio waves and X-rays are examples, travels at the velocity of light, in a vacuum. The only difference between the two is that the frequency of X-rays is very much higher than radio waves.
Hence, X-rays travels at a speed of ${ 3\times 10 }^{ 8 }m/s$.

Multiple choice physics electromagnetic waves properties and uses of different radiation electromagnetic spectrum spectrum

Read the following statements.
a. Ozone in found mostly in the stratosphere.
b. Ozone layer lies 55-75 kms above the surface of the earth.
c. Ozone absorbs ultraviolet radiation from the Sun.
d. Ozone layer has no significance for life on the earth.
Which set of the statements is correct ?

  1. a and c

  2. b and d

  3. b and c

  4. a and d
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Ozone layer also called ozonosphere contains relatively high concentrations of ozone ($O _{3}$) molecules. Approximately 90% of atmospheric ozone occurs in stratosphere, the region extending from 10 - 18 km to 50 km above the earth's surface. The ozone layer effectively blocks certain types of ultraviolet and other forms of radiations that could injure or kill most living things.

Multiple choice physics electromagnetic waves properties and uses of different radiation electromagnetic spectrum spectrum

Consider the following processes
(i) Electrical oscillation
(ii) Rapid deceleration of fast electrons
(iii) Atomic transition
Which of these are likely to produce visible light?

  1. (iii) only

  2. (ii) and (iii)

  3. (i) and (iii)

  4. (i), (ii) and (iii)
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Visible light means i.e visible to human eye.

It runs about $700-400㎚$
So Basically all of these options
  1. Electrical oscillation
  2. Rapid deceleration of fast electrons
  3. Atomic transition
This is basically theoretical question.

Multiple choice physics electromagnetic waves properties and uses of different radiation electromagnetic spectrum spectrum

Les-energetic electromagnetic radiations like X-rays are generated in the

  1. Radiation zone

  2. Convection zone

  3. Photosphere

  4. Chromosphere
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

We know that radiation is emission or transmission of energy in the form of waves or particles.

$X$ rays make up $X$-radiation, a form of electromagnetic radiation.
That's why $X$ rays are generated in radiation zone.

Multiple choice physics electromagnetic waves properties and uses of different radiation electromagnetic spectrum spectrum

Infrared radiations are used in

  1. Microwave ovens

  2. Long distance photography

  3. Microscopes

  4. Treatment of cancer
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Infrared radiation are used in microwaves ovens in electronagnetiic spectrum frequency and energy of microwave is smaller than visible light water contain is required for coobing food in microwave oven almost all food item contain some water contain.Microwaves interact with water molecules all atoms via their electric and magnetic fileds. Temprature of water molecules increases by this these water molecule share this energy with neighbouring food molecules, heating up the food.

Multiple choice physics electromagnetic waves properties and uses of different radiation electromagnetic spectrum spectrum

Hydrogen atom does not emit X-rays because

  1. it contains only a single electron

  2. energy levels in it are far apart

  3. its size is very small

  4. energy levels in it are very close to each other
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Hydrogen is the least energetic element. Even the most energetic line that hydrogen emits (when an electron drops down from the second shell to the first) has only enough energy to be an ultraviolet photon. This is because the energy levels in hydrogen atom are very close. So hydrogen atoms do not emit X rays.

Multiple choice physics electromagnetic waves properties and uses of different radiation electromagnetic spectrum spectrum

Which one of following have highest frequency?

  1. radio waves.

  2. infrared.

  3. ultraviolet.

  4. gamma rays.
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Frequency of Radio waves = $<3\times { 10 }^{ 9 }$Hz

Frequency of infrared waves = $3\times { 10 }^{ 9 }-3\times { 10 }^{ 11 }$Hz
Frequency of ultraviolet waves = $7.5\times { 10 }^{ 14 }-3\times { 10 }^{ 17 }$Hz
Frequency of gamma rays = $>3\times { 10 }^{ 20 }$Hz

So Gamma rays have highest frequency.