Q.1
Two particles A and B are in motion. If the wavelength associated with particle A is 5 × 10⁻⁸ m ; calculate the wavelength associated with particle B if its momentum is half of A.
  • b) 10–5 cm
  • c) 10–7 cm
  • a) 5 × 10⁻⁸ m
  • d) 5 × 10⁻⁸ cm
Q.2
The wavelength of radiation emitted, when in He+ electron falls from infinity to stationary state would be (R = 1.097 × 107 m–1)
  • c) 120 m
  • d) 22 × 107 m
  • a) 2.2 × 10⁻⁸ m
  • b) 2.2 × 10⁻⁹ m
Q.3
The frequency of radiation emitted when the electron falls from n = 4 to n = 1 in a hydrogen atom will be (Given ionization energy of H = 2.18 × 10⁻¹⁸ J atom–1 and h = 6.625 × 10⁻³⁴ Js)
  • a) 1.54 × 1015 s–1
  • b) 1.03 × 1015 s–1
  • c) 3.08 × 1015 s–1
  • d) 2.00 × 1015 s–1
Q.4
The work function of a metal is 4.2eV. If radiations of 2000Ao fall on the metal then the kinetic energy of the fastest photo electron is
  • b) 16 ×1010 J
  • a) 1.6 ×10⁻¹⁹ J
  • c)3.2 ×10⁻¹⁹ J
  • d)6.4 × 10⁻¹⁰ J
Q.5
The wavelength associated with golf ball weighing 200g and moving at speed of 5m/h is of the order... [ IIT 2001]
  • a) 10-10 m
  • b) 10-20 m
  • c) 10-30 m
  • d) 10-40 m
Q.6
The mass of one mole of electron is
  • b) 0.55 mg
  • d)1.005 mg
  • a) 9.1 × 10⁻²⁸ g
  • c)9.1 × 10⁻²⁴ g
0 h : 0 m : 1 s