The intensity of the maxima in a diffraction grating is generally greater than in Young's double-slit experiment. This is because a diffraction grating consists of a large number of closely spaced slits, which leads to more constructive interference and narrower diffraction maxima compared to the double-slit arrangement.
In Young's double-slit experiment, two parallel slits are used, and the interference pattern is created by the superposition of waves from the two slits. The resulting pattern consists of alternating bright and dark fringes, with the central maximum being the brightest. The intensity of the maxima decreases as you move away from the central maximum.
On the other hand, a diffraction grating consists of a large number of parallel and equally spaced slits. The interference pattern created by a diffraction grating is characterized by a series of very sharp and narrow intensity peaks, known as maxima. These maxima are much brighter compared to the corresponding fringes in the double-slit experiment.
The greater intensity of the maxima in a diffraction grating is a result of the constructive interference from multiple slits, leading to a higher concentration of energy in these regions. However, it's important to note that the exact intensity distribution depends on various factors such as the number of slits, the spacing between them, and the wavelength of light used.