Laser light of wavelength of 640 nm is incident normally at a diffraction grating.
The separation between adjacent lines (slits) is 3.3 × 10–6 m.
What is the total number of bright spots that can be observed in the diffraction pattern?
5
6
10
11
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An electron makes a transition between the two energy levels shown below.
This transition produces a photon of frequency 4.10 × 1014 Hz.
What is the value of the energy level X?
−2.68 × 10−19 J
−2.72 × 10−19 J
−5.40 × 10−19 J
−8.12 × 10−19 J
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The intensity against wavelength graph of an object at 750 °C peaks at a wavelength of λ. The temperature of the object is raised to 960 °C.
What is the wavelength now at the new peak intensity in terms of λ?
0.78 λ
0.83 λ
1.2 λ
1.3 λ
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Part of the line spectrum for light from the Sun is shown below.
Which spectrum best shows light from a similar star to the Sun?
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The diagram below shows two energy levels for the electron in the hydrogen atom.
The electron makes the transition shown by the arrow.
What is the wavelength of the photon emitted?
293 nm
366 nm
488 nm
1460 nm
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