2. 37) A metal ring is oriented with the plane of its area perpendicular to a sp

Question

2. 37) A metal ring is oriented with the plane of its area perpendicular to a spatially uniform magnetic field that increases at a steady rate. After the radius of the ring is quadrupled, while the rate of increase of the field is cut to half, the emf induced in the ring (Points 5) O A) remains the same O B) increases by a factor of 2 O C) increases by a factor of 4 O D) increases by a factor of 8 O E) decreases by a factor of 2 3. 38) Light falling on a metal surface causes electrons to be emitted from the metal by the photoelectric effect. As we decrease the intensity of this light, but keep its wavelength the same, (Points 5) O A) the number of electrons emitted from the metal increases O B) the number of electrons emitted from the metal remains the same O C) the number of electrons emitted from the metal decreases O D) the maximum speed of the emitted electrons decreases as the intensity of the incident light decreases O E) the maximum speed of the emitted electrons increases as the intensity of the incident light decreases 4. 39) A nucleus containing 60 nucleons has a radius R. The radius of a nucleus containing 180 nucleons would be closest to (Points : 5) O A) 3R O B) 32/3r - 2.08R O c) 31/3r 1.44R O D) 3-1/3r R/1.44 O E) 31/2R 1.73R

Explanation / Answer

2) Emf increased by a factor 8 (option D)

3) No. of electrons emitted from metal decreases (option C)

4) 1.44 R (option (C))

5) 18 neutrons (option E)

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