A planetransmissiongratinghaveing 8000 lines per cm is hevingused at normal incidence. Find the longest wavelength which canbe obscraved in the first order.

Aparallel beam of sodium lignt falls normally of a plane grating having 4240 lines per cm. A second order line is obseved at 30^(@) to the normal. Find the wavelength. What is the highest order that can be observed with this grating? Will this line appear to be of the same colour in each order ?

A cubical box has each edge 10 cm. Find the length of longest rod which can be put into the box.

Which of the following lines of Balmer series has longest wavelength?

A. diffraction grating has 800 lines per mm and is illuminated normally by parallel monochromatic light of wavelengths 560 nm and 590 nm. Calculate the difference in the angular positions of the first order spectra of the two lights on th same suide of the normal.

A diffraction grating having 600 lines per mm is illuminated normally by light of wovelength 600 Å What is the heghest order of diffraction image that can be seen ?

In hydrogen spectrum shortest wave length for lyman series line is lamda , then find the longest wavelength of Balmer series line in He^+ ion spectrum

Lithium has a work function of 2.3eV . It is exposed to light of wavelength 4800Å . Find the maximum kinetic energy with which electron leaves the surface. What is the longest wavelength which can produce the photoelectrons?

A double slit of separation 1.5 mm is illuminated by white light (between 4000 and 8000 Å ). On a screen 120 cm away colored interference pattern is formed. If a pinhole is made on this screen at a distance of 3.0 mm from the central white fringe, some wavelengths will be absent in the transimitted light. Find the second longest wavelength (in Å ) which will be absent in the transmitted light.