1
JEE Main 2022 (Online) 28th June Evening Shift
MCQ (Single Correct Answer)
+4
-1
Change Language

Let K1 and K2 be the maximum kinetic energies of photo-electrons emitted when two monochromatic beams of wavelength $$\lambda$$1 and $$\lambda$$2, respectively are incident on a metallic surface. If $$\lambda$$1 = 3$$\lambda$$2 then :

A
$${K_1} > {{{K_2}} \over 3}$$
B
$${K_1} < {{{K_2}} \over 3}$$
C
$${K_1} = {{{K_2}} \over 3}$$
D
$${K_2} = {{{K_1}} \over 3}$$
2
JEE Main 2022 (Online) 28th June Evening Shift
MCQ (Single Correct Answer)
+4
-1
Out of Syllabus
Change Language

Following statements related to radioactivity are given below :

(A) Radioactivity is a random and spontaneous process and is dependent on physical and chemical conditions.

(B) The number of un-decayed nuclei in the radioactive sample decays exponentially with time.

(C) Slope of the graph of loge (no. of undecayed nuclei) Vs. time represents the reciprocal of mean life time ($$\tau$$).

(D) Product of decay constant ($$\lambda$$) and half-life time (T1/2) is not constant.

Choose the most appropriate answer from the options given below :

A
(A) and (B) only
B
(B) and (D) only
C
(B) and (C) only
D
(C) and (D) only
3
JEE Main 2022 (Online) 28th June Evening Shift
MCQ (Single Correct Answer)
+4
-1
Change Language

In the given circuit the input voltage Vin is shown in figure. The cut-in voltage of p-n junction diode (D1 or D2) is 0.6 V. Which of the following output voltage (V0) waveform across the diode is correct?

JEE Main 2022 (Online) 28th June Evening Shift Physics - Semiconductor Question 64 English

A
JEE Main 2022 (Online) 28th June Evening Shift Physics - Semiconductor Question 64 English Option 1
B
JEE Main 2022 (Online) 28th June Evening Shift Physics - Semiconductor Question 64 English Option 2
C
JEE Main 2022 (Online) 28th June Evening Shift Physics - Semiconductor Question 64 English Option 3
D
JEE Main 2022 (Online) 28th June Evening Shift Physics - Semiconductor Question 64 English Option 4
4
JEE Main 2022 (Online) 28th June Evening Shift
MCQ (Single Correct Answer)
+4
-1
Out of Syllabus
Change Language

Amplitude modulated wave is represented by $${V_{AM}} = 10\,[1 + 0.4\cos (2\pi \times {10^4}t)]\cos (2\pi \times {10^7}t)$$. The total bandwidth of the amplitude modulated wave is :

A
10 kHz
B
20 MHz
C
20 kHz
D
10 MHz
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