A Young's Double-Slit Apparatus Is Set Up

question 27

Multiple Choice

A Young's double-slit apparatus is set up.A screen is positioned 1.16 m from the double slits,and the spacing between the two slits is 0.0500 mm.The distance between alternating bright fringes is 1.42 cm.What is the light source wavelength? (1 nm = 10−⁹ m)

• A) 612 nm
• B) 280 nm
• C) 490 nm
• D) 355 nm