Atomic Number

This worksheet consists of questions and answers related to Atomic number, mass number, Planck’s theory etc.

Atomic number is also known as proton number. Atomic number is the number of protons found in the nucleus of an atom. It is represented by the symbol ‘Z’. The atomic number is used to identify the chemical element.


Worksheet Questions


1. The correct representation of Moseley equation is:

(a)    \sqrt{f} = a (Z- n)^2

(b)   \sqrt{f} = a (Z- n)^\frac{1}{3}

(c)    \sqrt{f} = a (Z- n)

(d)   f = \sqrt{a (Z- n)}


2. If an atom has 11e^- and 12 neutrons, its mass no. will be:

(a)    22

(b)   23

(c)    21

(d)   24


3. Which of the following relates to photons both as wave motion and as a stream of particles?

(a)    E = mc^2

(b)   Diffraction

(c)    Interferences

(d)   E = hv


4. The frequency of yellow light having wavelength of 600 nm is?

(a)    5 \times 10^{10} hz. \, \, or \, \, sec^{-1}

(b)   5 \times 10^{14} sec^{-1}

(c)    7.5 \times 10^7 sec^{-1}

(d)   6 \times 10^{14} sec^{-1}


5. The correct order of increase of frequency will be:

(a)    U.V. Rays > X-Rays > \gamma-Rays > Cosmic Rays

(b)   Cosmic Rays >  \gamma-Rays > X-Rays > U.V. Rays

(c)    U.V. Rays < X-Rays < \gamma-Rays < Cosmic Rays

(d)   X-Rays < \gamma-Rays < U.V. Rays < Cosmic Rays


Worksheet Answers:

1. (c)     2. (b)     3. (d)     4. (b)     5. (c)

Related posts:

  1. Alpha, Beta, Gamma Introduction, ratio etc. Alpha is the first Greek first alphabet....
  2. Atomic Model Atomic model An atom is the defined as the smallest...
  3. Atomic Mass Atomic Mass. What is Atomic Mass? the infinitesimally small mass...
  4. Complex Number Formula Complex number Formula A complex number is one of the...
  5. Group Displacement Law Worksheet Group displacement law, series, units, number of Group displacement law...