1
JEE Main 2022 (Online) 26th June Evening Shift
MCQ (Single Correct Answer)
+4
-1
Change Language

A metallic conductor of length 1 m rotates in a vertical plane parallel to east-west direction about one of its end with angular velocity 5 rad s$$-$$1. If the horizontal component of earth's magnetic field is 0.2 $$\times$$ 10$$-$$4 T, then emf induced between the two ends of the conductor is :

A
5 $$\mu$$V
B
50 $$\mu$$V
C
5 mV
D
50 mv
2
JEE Main 2022 (Online) 26th June Evening Shift
MCQ (Single Correct Answer)
+4
-1
Change Language

Which is the correct ascending order of wavelengths?

A
$$\lambda$$visible < $$\lambda$$X-ray < $$\lambda$$gamma-ray < $$\lambda$$microwave
B
$$\lambda$$gamma-ray < $$\lambda$$X-ray < $$\lambda$$visible < $$\lambda$$microwave
C
$$\lambda$$X-ray < $$\lambda$$gamma-ray < $$\lambda$$visible < $$\lambda$$microwave
D
$$\lambda$$microwave < $$\lambda$$visible < $$\lambda$$gamma-ray < $$\lambda$$X-ray
3
JEE Main 2022 (Online) 26th June Evening Shift
MCQ (Single Correct Answer)
+4
-1
Change Language

For a specific wavelength 670 nm of light coming from a galaxy moving with velocity v, the observed wavelength is 670.7 nm. The value of v is :

A
3 $$\times$$ 108 ms$$-$$1
B
3 $$\times$$ 1010 ms$$-$$1
C
3.13 $$\times$$ 105 ms$$-$$1
D
4.48 $$\times$$ 105 ms$$-$$1
4
JEE Main 2022 (Online) 26th June Evening Shift
MCQ (Single Correct Answer)
+4
-1
Change Language

A metal surface is illuminated by a radiation of wavelength 4500 $$\mathop A\limits^o $$. The ejected photo-electron enters a constant magnetic field of 2 mT making an angle of 90$$^\circ$$ with the magnetic field. If it starts revolving in a circular path of radius 2 mm, the work function of the metal is approximately :

A
1.36 eV
B
1.69 eV
C
2.78 eV
D
2.23 eV
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