Q. No.
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, ]
| 1. | 2192 m | 2. | 21.92 cm |
| 3. | 219.3 m | 4. | 219.2 m |
A 100-watt bulb emits monochromatic light with a wavelength of 400 nm.
How many photons does it emit every second?
1. \(40.12 \times 10^{20} \ s^{-1}\)
2. \(2.012 \times 10^{21} \ s^{-1}\)
3. \(2.012 \times 10^{20} \ s^{-1}\)
4. \(20.12 \times 10^{21} \ s^{-1}\)
The mass of a photon with wavelength 3.6 Å is :
| 1. | 5.135 × 10–29 kg | 2. | 61.35 × 10–33 kg |
| 3. | 613.5 × 10–29 kg | 4. | 6.135 × 10–33 kg |
A gas absorbs a photon of 355 nm and emits at two wavelengths. If one of the emissions is at 680 nm, the other is at:
1. 1035 nm
2. 325 nm
3. 743 nm
4. 518 nm
The number of electrons that can be present in the subshells having ms value of \(-\frac{1}{2}\) for n = 4 are:
| 1. | 36 | 2. | 4 |
| 3. | 16 | 4. | 2 |
1. 2p and 3p
2. 4p
3. 2p
If the position of the electron were measured with an accuracy of +0.002 nm, the uncertainty in the momentum of the electron would be:
1. 5.637 × 10–23 kg m s–1
2. 4.637 × 10–23 kg m s–1
3. 2.637 × 10–23 kg m s–1
4. 3.637 × 10–23 kg m s–1
1. 32.22 × 10–16 J
2. 12.22 × 10–16 J
3. 22.27 × 10–16 J
4. 31.22 × 10–16 J
In Rutherford's \(\alpha\)-particle scattering experiment, a thin foil of heavy metals like gold or platinum is typically used. If a lighter metal foil, such as aluminum, were used instead, how would the observed deflection patterns change?
1. The same results will be observed
2. More deflection would be observed
3. There will not be enough deflection
4. None of the above
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