In a spectrometer experiment monochromatic light is incident normally on a diffraction gratin having 4.5 x 105 lines per metre The second order line is seen at an angle of 30 o to The normal What is the wavelength of the light.
A spring obeying Hooke's law has an upstretched length 50 mm and a spring constant of 400 N m-1 What is the tension in the spriing when its overall length is 70 mm.
The frequency of the fundamental mode of transverse vibration of a stretched wire 1,000 mm long is 256 Hz When the wire is shortened to 400 mm at the same tension
