The wavelength of carrier wave in optical cable fiber is : (A) `900 nm` (B) `2700 nm` (C) `1500 nm` (D) `2000 nm`

The wavelength of red light is close to 700 nm.

The wavelength of the carrier waves in a modern optical fiber communication network is close to :

Cyclic photophosphorylation occurs when only light of wavelengths _______ are available. (i) Below 680 nm (ii) Beyond 680 nm (iii) 400 nm and below (iv) Beyond 400 nm

Wavelengths of different radiations are given below: (A) 300nm (B) 300 mu m (C) 3nm ( 30A^(@) Arrange these radiations in the increasing order of their energies.

Using figure (22.1), find the relative luminosity of wavelength (a) 480 nm, (b) 520 nm (c ) 580 nm and (d) 600 nm.

The largest wavelength in the ultraviolet region of the hydrogen spectrum is 122nm. The smallest wavelength in the infrared region of the hydrogen spectrum (to the nearest interger) is (a) 802 nm (b) 823 nm (c ) 1882 nm (d) 1648 nm.

The wavelength of particular radiation is 700 " nm" (1" nm"-10^(-9)"m") .Find its frequency (v).

The work function of a substance is 4.0 eV. The longest wavelength of light that can cause photoelectron emission from this substance is approximately. (a) 540 nm (b ) 400nm (c ) 310 nm (d) 220 nm