1. When light coming from a remote planet was passed through a spectrometer ther

Question

1. When light coming from a remote planet was passed through a spectrometer there were some dark lines on the spectra. It means that:

a. atoms are present in the atmosphere that have electrons that are emitting photons of those wavelengths.

b. atoms that would produce light of the darkened frequency bands aren’t present in the atmosphere.

c. atoms that would produce light of the darkened wavelength bands are forbidden from doing so because of quantum effects.

d. atoms are present in the atmosphere that have electrons that are absorbing photons of those wavelengths.

2. According to the uncertainty principle, halving the uncertainty in position is accompanied by __________ the minimum uncertainty in momentum.

a. halving

b. quartering

c. doubling

d. quadrupling

e. no change in

Explanation / Answer

1. Answer d- atoms are present in the atmosphere that have electrons that are absorbing photons of those wavelengths.

According to quantum physics, electron get excited to a higher energy level by absorbing a photon which has exactly the energy difference between the 2 energy levels. So, when the photon go through the atmosphere, electrons in some atoms absorb the photon and jump to a higher energy level causing no signal in the correspoding wavelength which makes dark line in the spectrum

2.Answer c.doubling

According to heisenberg principle, dx.dp >= h ;

So, when uncertainity in poition(dx) is halved dp is doubled

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