1
NEET 2020 Phase 1
MCQ (Single Correct Answer)
+4
-1
Light with an average flux of 20 W/cm2 falls on a non-reflecting surface at normal incidence having surface area 20 cm2. The energy received by the surface during time span of 1 minute is :
A
12 $$ \times $$ 103 J
B
24 $$ \times $$ 103 J
C
48 $$ \times $$ 103 J
D
10 $$ \times $$ 103 J
2
NEET 2020 Phase 1
MCQ (Single Correct Answer)
+4
-1
An electron is accelerated from rest through a potential difference of V volt. If the de-Broglie wavelength of the electron is 1.227 $$ \times $$ 10-2 nm, the potential difference is :
A
102 V
B
103 V
C
104 V
D
10 V
3
NEET 2019
MCQ (Single Correct Answer)
+4
-1
An electron is accelerated through a potential difference of 10,000 V. Its de Broglie wavelength is (nearly) : (me = 9 $$ \times $$ 10–31 kg)
A
12.2 × 10–12 m
B
12.2 × 10–13 m
C
12.2 × 10–14 m
D
12.2 nm
4
NEET 2018
MCQ (Single Correct Answer)
+4
-1
An electron of mass m with an initial velocity $$\overrightarrow v = {v_0}\widehat i$$ (v0 > 0) enters an electric field $$\overrightarrow E = - {\overrightarrow E _0}\widehat i$$ (E0 = constant > 0) at t = 0. If $$\lambda $$0 is its de-Broglie wavelength initially, then its de- Broglie wavelength at time t is
A
$${{{\lambda _0}} \over {\left( {1 + {{e{E_0}} \over {m{v_0}}}t} \right)}}$$
B
$${{\lambda _0}\left( {1 + {{e{E_0}} \over {m{v_0}}}t} \right)}$$
C
$$\lambda $$0t
D
$$\lambda $$0
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