Anyone can explain these 3 physics questions? Blue means the correct answer, I h

Question

Anyone can explain these 3 physics questions?

Blue means the correct answer, I have no idea why.

Light of frequency f(hf > the work function) and intensity I is incident on a metal. If the light intensity is increased without changing the frequency, the stopping potential will: Suppose the de Broglie wavelengths of a proton and an electron both moving at non-relativistic speeds are equal. If the kinetic energies of the electron and the proton are, respectively, KEe and KEp, which of the following statements is correct? An electron is confined in a 1 -dimensional box of length L. Which of the following transitions will result in a photon of the longest wavelength?

Explanation / Answer

Here,

II) as the stopping potential dependent on the work function and energy of incident ,

as increasing the light intensity without changing the frequency will only increase in the number of photons.

this has no effect on work function and energy of incident photon

hence , the stopping potential will c) stay unchanged

III)

wavelength = h/sqrt(2 * m * KE)

for same wavelength of electron and proton

as mass of proton is larger than the electron

the kinetic energy of proton will be larger than the electron

Hence , a) KEe > KEp

IV)

for the longest wavelength ,

the energy difference between the levels must be minimum

as the energy difference is minimum for n2= 3 to n1 = 1

the longest wavelength is produced when

c) from n2 = 2 to n1 = 1

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