Electromagnetic radiation, photoelectric effect, hydrogen spectrum
- The ratio of the wavelengths of the light absorbed by a Hydrogen atom when it undergoes n=2 → n=3 and n=4 → n=6 transitions, respectively, is Answer: 4. 1/4 Key idea: absorbed wavelength is inversely proportional to the energy gap, 1/λ∝(1/n₁²-1/n₂²) . For 2→3 : 1/4-1/9=5/36 , so λ₁... 1
- A particular station of All India Radio, New Delhi, broadcasts on a frequency of 1,368 kHz (kilohertz). The wavelength of the electromagnetic radiation emitted by the transmitter is : [speed of light, c=3.0×10^8 ms^-1] Answer: 1. 219.3 m Key idea: λ=c/ν . ν=1368\ kHz=1.368×10⁶\ mathrms⁻¹ λ=3.0×10⁸/1.368×10⁶=219.3\ m . 1
- Choose the correct option for graphical representation of Boyle's law, which shows a graph of pressure vs. volume of a gas at different temperatures : Answer: 4. [graph option - see figure] Key idea: Boyle's law: PV=constant at fixed T, so P vs V is a rectangular hyperbola. A higher T gives... 1