DUAL NATURE OF MATTER AND RADIATION

De-Broglie equation states the:

• (a) dual nature

• (b) particle nature

• (c) wave nature

• (d) none of these

Protons and alpha particles have the same de-Broglie wavelength. What is same for both of them ?

• (a) Energy

• (b) Time period

• (c) Frequency

• (d) Momentum

Kinetic energy of emitted electrons depends upon :

• (a) frequency

• (b) intensity

• (c) nature of atmosphere surrounding the electrons

• (d) none of these

De-Broglie wavelength of a body of mass m and kinetic energy E is given by (symbols have their usual meanings):

• (a) h/√2mE
  

• (b) h/2mE

• (c)√ 2mE/h

• (d) h/mE

The work function of photoelectric material is 3.3 eV. The threshold frequency will be equal to:

• (a) 8 × 10¹⁴ Hz

• (b) 8 × 10¹⁰ Hz

• (c) 5 × 10¹⁰ Hz

• (d) 4 × 10¹⁴ Hz

The ratio of specific charge of an alpha particle to the proton is:

• (a) 1 : 2

• (b) 2 : 1

• (c) 4 : 1

• (d) 1 : 4

The strength of photoelectric current depends upon :

• (a) angle of incident radiation

• (b) frequency of incident radiation

• (c) intensity of incident radiation

• (d) distance between anode and cathode

The momentum of an electron that emits a wavelength of 2 Å. will be:

• (a) 6.4 × 10^-36 kgms^-1

• (b) 3.3 × 10^-24 kgms^-1

• (c) 3.3 × 10^-34 kgms^-1

• (d) none of these

Which of the following radiations cannot eject photo electrons?

• (a) ultraviolet

• (b) infrared

• (c) visible

• (d) X-rays

What is the de-Broglie wavelength of an electron accelerated from rest through a potential difference of V volts?

• (a) 12.3/V² Å

• (b) 12.3/VÅ

• (c) 12.2/V² Å

• (d) None of these