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Comment with a brief explanation whether the following statements are true or false: 1. The wavelength of an...

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Physics

Comment with a briefexplanation whether the following statements are true or false:

1. The wavelength ofan electron moving with a velocity of 1.1*10^6 m/s is 6.6 nm.

2. In photoelectriceffect, whether an electron will be ejected by light is determinednot by the intensity of light but by the wavelength.

3. The temperature ofa star can be determined using its radiation spectrum.

4.Resistance-temperature-detector is based on resistivity of a metaldecreasing with temperature.

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