KCET 2020 | Dual Nature of Radiation Question 10 | Physics

A hot filament liberates an electron with zero initial velocity. The anode potential is $$1200 \mathrm{~V}$$. The speed of the electron when it strikes the anode is

$$1.5 \times 10^5 \mathrm{~ms}^{-1}$$

$$2.5 \times 10^6 \mathrm{~ms}^{-1}$$

$$2.1 \times 10^7 \mathrm{~ms}^{-1}$$

$$2.5 \times 10^8 \mathrm{~ms}^{-1}$$

KCET 2020

MCQ (Single Correct Answer)

-0

The de-Broglie wavelength associated with electron of hydrogen atom in this ground state is

0.3 $$\mathop A\limits^o$$

3.3 $$\mathop A\limits^o$$

6.26 $$\mathop A\limits^o$$

10 $$\mathop A\limits^o$$

KCET 2020

MCQ (Single Correct Answer)

-0

The following graph represents the variation of photocurrent with anode potential for a metal surface. Here $$I_1, I_2$$ and $$I_3$$ represents intensities and $$\gamma_1, \gamma_2, \gamma_3$$ represent frequency for curves $$1,2$$ and $$3$$ respectively, then

KCET 2020 Physics - Dual Nature of Radiation Question 3 English

$$\gamma_1=\gamma_2$$ and $$I_1 \neq I_2$$

$$\gamma_1=\gamma_3$$ and $$I_1 \neq I_3$$

$$\gamma_1=\gamma_2$$ and $$I_1=I_2$$

$$\gamma_2=\gamma_3$$ and $$I_1=I_3$$

KCET 2019

MCQ (Single Correct Answer)

-0

An electron is moving with an initial velocity $$\mathbf{v}=v_0 \hat{\mathbf{i}}$$ and is in a uniform magnetic field $$\mathbf{B}=B_0 \hat{\mathbf{j}}$$. Then its de-Broglie wavelength

remains constant

increases with time

decrease with time

increase and decrease periodically

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