Related InterviewSolutions

• The momentum of a photon having energy equal to the rest energy of an electron isA. zeroB. `2.73 xx 10^(-22)kg ms^(-1)`C. `1.99 xx 10^(-24)kg ms^(-1)`D. infinite
• In an oil experiment, the following charges (in arbitrary units) were found on a series of oil droplets:A. `2.30xx10^(-15)`B. `1.15xx10^(-15)`C. `1.38xx10^(-14)`D. `1.955xx10^(-14)`
• A moving electron has numerical relation `lambda=h`. Then,A. `m_(e)=(1)/(v_(e))`B. `v_(e)=(1)/(m_(e))`C. both a and bD. None of these
• An `alpha`-particle when accelerated through a potential of V volt has a wavelength `lambda` associated with it, but if a proton in order to have same wavelength `lambda` by what potential difference it must be accelerated?A. 8 VB. 6 VC. 4 VD. 12 V
• The voltage applied to an electron microscope to produce electrons of wavelength `0.50 Å` isA. 602 VB. 50 VC. 138 VD. 812 V
• If the velocity of an electron is doubled, its de-Broglie frequency will beA. halfB. remain sameC. doubledD. become four times
• The cathode ray particles originate in a discharge tube from theA. cathodeB. anodeC. source of high voltageD. residual gas
• A surface is irradiated with ultraviolet radiation of wavelength `0.2 mum`. If the maximum velocity of electron liberated from the surface is `8.8 xx 10^(5)m//s`, then find the work function of the surface.A. 3 eVB. 4 eVC. 5 eVD. 6 eV
• An X-ray tube is operating at 15 kV. The lower limit of the wavelength of X-ray produced isA. `0.82 xx 10^(-7)m`B. `0.82 xx 10^(-8)m`C. `0.83 xx 10^(-10)m`D. `0.82 xx 10^(-13) m`
• If `n_(r )` and `n_(b)` are the number of photons of red and blue light respectively with same energy, thenA. `n_(r ) gt n_(b)`B. `n_(r ) lt n_(b)`C. `n_(r ) = n_(b)`D. no relation between `n_(r )` and `n_(b)`