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

State whether true or false :

Ultraviolet rays are used to take photographs in darkness.

  1. True

  2. False
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Wrong

Infrared is used in dark for photography. All body emit infrared radiation every time.
Since infrared radiation is invisible, photography in total darkness can be readily carried out if infrared film is used and the light source is covered with a light-absorbing but infrared-transmitting filter.

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

The part of the electromagnetic spectrum which is suitable for radar systems used in aircraft navigation :

  1. X-Rays

  2. Gamma Rays

  3. Microwaves or short radiowaves 

  4. Ultraviolet
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Microwaves or short radiowaves are suitable for radar systems used in aircraft navigation because of their short wavelengths.

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

 Which one of waves tans our skin and causes some substances to become fluorescent?

  1. infrared waves.

  2. ultraviolet waves.

  3. gamma rays.

  4. infrared and ultraviolet waves both.
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Ultraviolet rays (or waves) tan our skin and cause some substances to become fluoroseun sun is important source of ultraviolet light. Sun rays reach our skin and burns the upper layer of skin, causing sunburns prolonged doses of UV radiation can induce skin cancer in human beings.

Ozone layer is protecting us from UV rays but the problem is that Ozone layer is also depleting because of excessive use of CFC's.

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

Which one of waves cannot be seen through electromagnetic spectrum?

  1. radio waves

  2. micro waves.

  3. infrared waves.

  4. ultraviolet waves.
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation
Red, blue, green, yellow, orange colors are all part of electromagnetic spectrum that are visible to human eye.
The part which is not visible are UV, X-RAY, GAMMA RAY which have lower wavelength than visible light and infrared, radio waves have higher wavelength than visible.
Multiple choice physics electromagnetic waves properties and uses of different radiation electromagnetic spectrum spectrum

To distinguish between real gems and artificial gems a merchant may use which of the following radiations?

  1. Infrared rays

  2. $\gamma$-rays

  3. X-rays

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

To distinguish between real gems and artificial gems a merchant may use infrared radiations. A number of synthetic gems can be distinguished from their natural counterparts by differences in their infrared spectra.  

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

Maximum diffraction takes place in a given slit for

  1. $\gamma $-rays

  2. Ultraviolet light

  3. Infrared light

  4. Radio waves
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation
When the gap size is larger than the wavelength, the wave passes through the gap and does not spread out much on the other side. When the gap size is equal to the wavelength, maximum diffraction occurs. So among all of them radio waves have minimum wavelength and hence it will give maximum diffraction. 
Multiple choice physics electromagnetic waves properties and uses of different radiation electromagnetic spectrum spectrum

The frequencies of X-rays, $\gamma-rays$ and ultra violet rays are respectively $p, q$ and $r$, then

  1. $p > q, q > r$

  2. $p < q, q > r$

  3. $p < q, q < r$

  4. $p > q, q < r$
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Increasing order of wavelengths as given below
$\gamma-rays < X-rays >$ ultravoilet rays
Frequency order
$\gamma-ray > X-rays >$ ultravoilet rays
$\Rightarrow q > p > r$
Thus, $q > p$
$q > r$
$p > r$.