Question 2 :
When cathode rays strike a metal target of high melting point with very high velocity, then
Question 3 :
Find out the wavelength of violet light which has a frequency of $7.5 \times 10^{14}Hz$ ?<br/>
Question 4 :
An electromagnetic radiation has an energy 14.4 eV. To which region of electromagnetic spectrum does it belong?
Question 5 :
For the production of X-rays, the target should be made of
Question 6 :
What is the range of wavelength of the spectrum of white light in $nm$?<br>
Question 9 :
The sun delivers $10^3\, Wm^{-2}$ of electromagnetic flux on the earth's surface. The total power that is incident on a roof of dimensions $6 \,m \times 30\, m$ is
Question 13 :
Name the rays or waves produced by the changes in the nucleus of an atom.<br/>
Question 14 :
The part of the electromagnetic spectrum which is produced by bombarding a metal target with high energy electrons is :
Question 15 :
The frequencies of X-rays, Gamma rays and visible light waves rays are $a, b$ and $c$ respectively, then:
Question 17 :
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:
Question 18 :
A parallel beam of light is incident normally on a plane surface absorbing 40 % of the light and reflecting the rest. If the incident beam carries 60 watt of power, the force exerted by it on the surface is:
Question 19 :
Which of the following electromagnetic waves is used in medicine to destroy cancer cell?
Question 20 :
A small metallic ball is suspended in a uniform electric field by a thread. If high energy X-rays are made to fall on it , then:
