1
NEET 2024 (Re-Examination)
+4
-1

If $$\phi$$ is the work function of photosensitive material in $$\mathrm{eV}$$ and light of wavelength of numerical value $$\lambda=\frac{h c}{e}$$ metre, is incident on it with energy above its threshold value at an instant then the maximum kinetic energy of the photo-electron ejected by it at that instant (Take $$h$$-Plank's constant, $$c$$-velocity of light in free space) is (in SI units):

A
$$e+2 \phi$$
B
$$2 e-\phi$$
C
$$e-\phi$$
D
$$e+\phi$$
2
NEET 2024
+4
-1

The graph which shows the variation of $$\left(\frac{1}{\lambda^2}\right)$$ and its kinetic energy, $$E$$ is (where $$\lambda$$ is de Broglie wavelength of a free particle):

A
B
C
D
3
NEET 2024
+4
-1

If $$c$$ is the velocity of light in free space, the correct statements about photon among the following are:

A. The energy of a photon is $$E=h v$$.

B. The velocity of a photon is $$c$$.

C. The momentum of a photon, $$p=\frac{h v}{c}$$.

D. In a photon-electron collision, both total energy and total momentum are conserved.

E. Photon possesses positive charge.

Choose the correct answer from the options given below:

A
A and B only
B
A, B, C and D only
C
A, C and D only
D
A, B, D and E only
4
NEET 2023 Manipur
+4
-1

The de Broglie wavelength associated with an electron, accelerated by a potential difference of 81 V is given by:

A
13.6 nm
B
136 nm
C
1.36 nm
D
0.136 nm
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