JEE Advanced Model Paper 20 with solutions for online practice

Question : 1 of 57

Marks: +1, -0

When a certain photoelectric substance was exposed to light with v = 4.0 × 1015 / s photoelectrons hadkinetic energy twice when a substance was exposed to v = 3.0 × 1015 / s. The threshold ν of photoelectricsubstance is