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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.

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

The wavelength of $X$-rays is in the range

  1. $0.001\mathring { A } $ to $1\mathring { A } $
  2. $0.001 nm$ to $1 nm$
  3. $0.001 \mu m$ to $1 \mu m$
  4. $0.001 cm $ to $1 cm$
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

$X$-Rays Wavelength range $=1\times { 10 }^{ -11 }m$ to $3\times { 10 }^{ -8 }m$
So,                          $=0.001 nm$ to $1 nm$

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

Which of the following is correct for X-rays?

  1. It has a beam of electrons

  2. It is electromagnetic waves

  3. It is positively charged particle

  4. It is negatively charged particles
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

X-rays are electromagnetic waves with a wavelength less than about $10^{-9}$m. Cathode rays comprise of a beam of electrons. $\alpha$-rays are made up of helium nucleus(i.e., $^{4} _{2}He^{2+}$), hence are made up of positively charged particles, whereas $\beta$-rays are made up of energetic electrons, hence comprise of negatively charged particles.