JEE Main 2021 (Online) 27th August Evening Shift | Dual Nature of Radiation Question 77 | Physics

A monochromatic neon lamp with wavelength of 670.5 nm illuminates a photo-sensitive material which has a stopping voltage of 0.48 V. What will be the stopping voltage if the source light is changed with another source of wavelength of 474.6 nm?

0.96 V

1.25 V

0.24 V

1.5 V

JEE Main 2021 (Online) 27th August Morning Shift

MCQ (Single Correct Answer)

-1

In a photoelectric experiment, increasing the intensity of incident light :

increases the number of photons incident and also increases the K.E. of the ejected electrons

increases the frequency of photons incident and increases the K.E. of the ejected electrons

increases the frequency of photons incident and the K.E. of the ejected electrons remains unchanged

increases the number of photons incident and the K.E. of the ejected electrons remains unchanged

JEE Main 2021 (Online) 26th August Evening Shift

MCQ (Single Correct Answer)

-1

The de-Broglie wavelength of a particle having kinetic energy E is $$\lambda$$. How much extra energy must be given to this particle so that the de-Broglie wavelength reduces to 75% of the initial value?

$${1 \over 9}$$E

$${7 \over 9}$$E

$${16 \over 9}$$E

JEE Main 2021 (Online) 26th August Morning Shift

MCQ (Single Correct Answer)

-1

In a photoelectric experiment ultraviolet light of wavelength 280 nm is used with lithium cathode having work function $$\phi$$ = 2.5 eV. If the wavelength of incident light is switched to 400 nm, find out the change in the stopping potential. (h = 6.63 $$\times$$ 10^$$-$$34 Js, c = 3 $$\times$$ 10⁸ ms^$$-$$1)

1.3 V

1.1 V

1.9 V

0.6 V

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