iCON Education - Dual Nature of Radiation BITSAT Test

Question 1: Palette 1/7

BITSAT 2023 MCQ

When 0.25$\mathop A\limits^o $ X-Rays strike a material, the photoelectrons from the $K$ shell are observed to more in a circle of radius $23 \mathrm{~mm}$ in magnetic field of $4 \times 10^{-2}$ tesla active perpendicularly to the direction of emission of photoelectrons. What is the Binding energy of $K$ shell electrons?

31.5 keV

23.71 keV

29.41 keV

24.9 keV

Question 2: Palette 2/7

BITSAT 2023 MCQ

In an electron gun the potential difference between the filament and plate is $4000 \mathrm{~V}$. What will be the velocity of electron emitting from the gain?

$3 \times 10^3 \mathrm{~m} / \mathrm{s}$

$3.18 \times 10^7 \mathrm{~m} / \mathrm{s}$

$3.52 \times 10^7 \mathrm{~m} / \mathrm{s}$

$3.75 \times 10^7 \mathrm{~m} / \mathrm{s}$

Question 3: Palette 3/7

BITSAT 2023 MCQ

An electron of mass $m$ and charge $e$ initially at rest gets accelerated by a constant field $2 E$. The rate of change of de-Broglie wavelength of this electron at time $t$ ignoring relativistic effects is

$-\frac{h}{\left(2 e E t^2\right)}$

$\frac{-e h t}{2 E}$

$\left(\frac{-2 m h}{e E t^2}\right)$

$\left(\frac{-h}{e E}\right)$

Question 4: Palette 4/7

BITSAT 2022 MCQ

The stopping potential (V₀) versus frequency $\nu $ of a graph for photoelectric effect in a metal. From the graph, the Plank's constant (h) is

BITSAT 2022 Physics - Dual Nature of Radiation Question 4 English

6.60 $\times$ 10^$-$34 J-s

6.69 $\times$ 10^$-$34 J-s

6.62 $\times$ 10^$-$34 J-s

6.63 $\times$ 10^$-$34 J-s

Question 5: Palette 5/7

BITSAT 2022 MCQ

The de-Broglie wavelength of an electron moving with a velocity $\frac{c}{3}$ (c = 3 $\times$ 10⁸ m/s) is equal to the wavelength of photon. The ratio of the kinetic energies of electron and photon is

1 : 4

1 : 3

1 : 2

2 : 1

Question 6: Palette 6/7

BITSAT 2021 MCQ

The potential difference applied to an X-ray tube is decreased. As a result, in the emitted radiation,

the intensity increases

the intensity decreases

the minimum wavelength increases

the minimum wavelength decreases

Question 7: Palette 7/7

BITSAT 2020 MCQ

Lights of two different frequencies whose photons have energies 1.5 eV and 2.5 eV respectively illuminate a metallic surface whose work function is 0.5 eV successively. Ratio of maximum speeds of emitted electrons will be

3 : 2

2 : 3

$\sqrt3$ : $\sqrt2$

$1 :\sqrt 2 $