Light of wavelength 630 nm falls on two slits and produces an interference pattern in which the third-order bright red fringe is 45 mm from the central fringe on a screen 3.0 m away. What is the separation of the two slits?

d = m×  λ⇒ d = λ ×m×l / x

= 630× m × 3×3m/ 45× m

= 1.26×m

Explanation:

the above calculation is based on Young’s double slit experiment where the two slits provide two coherent light sources which results either constructive interference or destructive interference when passing through a double slit.

multiple

answer: 802.3 kilo joules of energy represents 191.75 kilo calorie of energy.

explanation:

energy released during combustion of one mole methane = 802.3 kilo joules

if 1 kilo joule = 0.239006   kilo calorie

then ,802.3 kilo joule will be = 802.30.239006 kilo calorie

802.3 kilo joule = 191.75 kilo calorie

hence, the energy in kilo calorie is 191.75 kilo calorie.