1
COMEDK 2022
+1
-0

Ultraviolet light of wavelength 99 mm falls on a metal plate of work function 1.0 eV. If the mass of the electron is 9.1 $$\times$$ 10$$^{-31}$$ kg, the wavelength of the fastest photoelectron emitted is

A
0.63 nm
B
0.66 nm
C
0.33 nm
D
0.36 nm
2
COMEDK 2022
+1
-0

If K$$_1$$ and K$$_2$$ are maximum kinetic energies of photoelectrons emitted when lights of wavelengths $$\lambda_1$$ and $$\lambda_2$$, respectively incident on a metallic surface and $$\lambda_1=3\lambda_2$$, then

A
$${K_1} > \left( {{{{K_2}} \over 3}} \right)$$
B
$${K_1} < \left( {{{{K_2}} \over 3}} \right)$$
C
$${K_1} = 2{K_2}$$
D
$${K_2} = 2{K_1}$$
3
COMEDK 2021
+1
-0

The velocity of the proton is one-fourth the velocity of the electron. What is the ratio of the de-Broglie wavelength of an electron to that of a proton?

A
$$1$$
B
$$\frac{1}{2}$$
C
$$\frac{1}{3}$$
D
$$\frac{1}{4}$$
4
COMEDK 2021
+1
-0

From the figure describing photoelectric effect, we may infer correctly that

A
Na and Al both have the same threshold frequency
B
Maximum kinetic energy for both the metals depends linearly on the frequency
C
the stopping potential are different for Na and Al for the same change in frequency
D
Al is better photosensitive material than Na
EXAM MAP
Medical
NEET