1
KCET 2020
MCQ (Single Correct Answer)
+1
-0

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

A
0.3 $$\mathop A\limits^o$$
B
3.3 $$\mathop A\limits^o$$
C
6.26 $$\mathop A\limits^o$$
D
10 $$\mathop A\limits^o$$
2
KCET 2020
MCQ (Single Correct Answer)
+1
-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 12 English

A
$$\gamma_1=\gamma_2$$ and $$I_1 \neq I_2$$
B
$$\gamma_1=\gamma_3$$ and $$I_1 \neq I_3$$
C
$$\gamma_1=\gamma_2$$ and $$I_1=I_2$$
D
$$\gamma_2=\gamma_3$$ and $$I_1=I_3$$
3
KCET 2019
MCQ (Single Correct Answer)
+1
-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

A
remains constant
B
increases with time
C
decrease with time
D
increase and decrease periodically
4
KCET 2019
MCQ (Single Correct Answer)
+1
-0

Light of certain frequency and intensity incident on a photosensitive material causes photoelectric effect. If both the frequency and intensity are doubled, the photoelectric saturation current becomes

A
quadruple
B
doubled
C
halved
D
unchanged
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