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Dual Nature of Radiation and Matter

JEE Main 2024 (Online) 29th January Evening ShiftMCQEasy📈 Topic in 10% papers+4−1
Ques. 1JEE Main 2024, 29 January (Evening Shift)

Two sources of light emit with a power of 200 W. The ratio of number of photons of visible light emitted by each source having wavelengths 300 nm and 500 nm respectively, will be :

  1. 5:3
  2. 3:5
  3. 1:5
  4. 1:3

Answer

(2) 3:5

Solution

Power P=n hc (n = photons emitted per second)

∵ P is the same for both sources ⇒ n

n1n2= 1 2= 300500= 35

Answer: (2)

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Ques. 2JEE Main 2024, 27 January (Morning Shift)

A convex lens of focal length 40 cm forms an image of an extended source of light on a photoelectric cell. A current I is produced. The lens is replaced by another convex lens having the same diameter but focal length 20 cm. The photoelectric current now is :

  1. I2
  2. 4 I
  3. 2 I
  4. I
Ques. 3JEE Main 2024, 27 January (Evening Shift)

The threshold frequency of a metal with work function 6.63 eV is :

  1. 16 1015 Hz
  2. 16 1012 Hz
  3. 1.6 1015 Hz
  4. 1.6 1012 Hz

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