A photon of wavelength 2.0 nm Compton-scatters from an electron at an angle of 90°. What is the modified wavelength? ( )
A photon of wavelength 2.0 nm Compton-scatters from an electron at an angle of 90°. What is the modified wavelength? ( )
I don’t think we’re on the same wavelength." belongs to the sense of __
I don’t think we’re on the same wavelength." belongs to the sense of __
The wavelength of this musical note(音符) is 7.8 ft, over three times longer than the wavelength of the same note in air (2.5 ft).
The wavelength of this musical note(音符) is 7.8 ft, over three times longer than the wavelength of the same note in air (2.5 ft).
中国大学MOOC: "I don’t think we’re on the same wavelength." belongs to the sense of __
中国大学MOOC: "I don’t think we’re on the same wavelength." belongs to the sense of __
The wrong statement about the formula is ( ) A: The higher the frequency, the shorter the wavelength B: The lower the frequency, the shorter the wavelength C: The worse the penetration, the higher the discrimination D: the better the penetration, the lower the discrimination
The wrong statement about the formula is ( ) A: The higher the frequency, the shorter the wavelength B: The lower the frequency, the shorter the wavelength C: The worse the penetration, the higher the discrimination D: the better the penetration, the lower the discrimination
What is the shortest wavelength present in the Brackett series of spectral lines? ( )
What is the shortest wavelength present in the Brackett series of spectral lines? ( )
The wavelength ____ which the eye is most sensitive is 5.5×10-5 cm.
The wavelength ____ which the eye is most sensitive is 5.5×10-5 cm.
Nonselective scattering is caused by particles that are much larger than the wavelength of the scattered radiation. （ ）
Nonselective scattering is caused by particles that are much larger than the wavelength of the scattered radiation. （ ）
"I don’t think we’re on the same wavelength." belongs to the sense of __ A: feeling B: sight C: hearing D: sound
"I don’t think we’re on the same wavelength." belongs to the sense of __ A: feeling B: sight C: hearing D: sound
中国大学MOOC: The wavelength range of UV-B is .(280 nm-320 nm / 320 nm-360 nm)
中国大学MOOC: The wavelength range of UV-B is .(280 nm-320 nm / 320 nm-360 nm)