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

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.

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

If the distance that a radio wave can travel in the time of one complete cycle is $10$ metres, then the frequency of the radio wave in cycles per second is?

  1. $3\times 10^9$Hz

  2. $3\times 10^6$Hz

  3. $3\times 10^8$Hz

  4. $3\times 10^7$Hz
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

The speed of a wave is given by v = frequency x wavelength. Here, the distance traveled in one cycle is the wavelength (lambda = 10 m). Using v = 3 x 10^8 m/s, we get frequency = v / lambda = (3 x 10^8) / 10 = 3 x 10^7 Hz.

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

Study the frequency of the following electromagnetic radiations and select the correct relationship.
$1$. Infra red
$2$. Microwave
$3$. Ultra violet.

  1. $3 > 2 > 1$

  2. $3 > 1 > 2$

  3. $1 > 2 > 3$

  4. $2 > 3 > 1$
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Electromagnetic radiation frequency increases in the order: Microwave < Infrared < Ultraviolet. Therefore, Ultraviolet (3) > Infrared (1) > Microwave (2).

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

A beam of electrons accelerated by a large potential difference $V$ is made to strike a metal target to produce $X-$rays. For which of the following values of $V$, the resulting $X-$rays have the lowest minimum wave length:

  1. $10\ KV$

  2. $20\ KV$

  3. $30\ KV$

  4. $40\ KV$
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

As we know, $\boxed{E _{max}=\dfrac{hc}{\lambda _{min}}}$

$\boxed{\lambda _{min}=\dfrac{hc}{ev}}$
Here the value of $v$ is given as $10kv,20kv,30kv,40kv$
A, $\boxed{\lambda \propto \dfrac{1}{V}}$, large value of $V$
$\Rightarrow$ min. value of $\lambda$
Hence for $40kv$, $\lambda _{min}$ is minimum.
$\therefore$ option $D$ is correct.

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

Radio isotope useful in treating blood cancer is

  1. Cobalt 40

  2. Carbon 60

  3. Cobalt 60

  4. Carbon 14
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Cobalt therapy or cobalt $60$ therapy is the medical use of gamma rays from the radio isotope cobalt $-60$ to treat conditions such as cancer. Thus, Cobalt $-60$ is the radio isotope useful in treating the blood cancer.