Question

Which statements concerning light are true?

• A. It is a form of energy.
• B. It can be deflected by a magnet.
• C. It consists of photons of same energy.
• D. It is a part of electromagnetic spectrum.

Answer 1

Answer: (A), (D)

The correct options are
A It is a form of energy.
D It is a part of electromagnetic spectrum.

(A) Light is a form of energy. The energy of light is given by the expression $E=h\nu =hc\overline{\nu }=\frac{hc}{\lambda }$
(B) Light is a electromagnetic radiation and cannot be deflected by a magnet.
(C) Monochromatic light consists of photons of same energy. Plychromatic light consists of photons of different energy.
(D) Light (visible light) is a part of electromagnetic spectrum. UV and IR radiations are also part of electromagnetic spectrum.