What is the wavelength of the matter wave associated with an electron moving with a speed of 2.5 × 107 m/s? (melectron = 9.11 × 10-31 kg, h = 6.626 × 10-34 J ? s)
A) 29 pm
B) 35 pm
C) 47 pm
D) 53 pm
A
Physics & Space Science
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Doppler Effect: What is the frequency does a stationary observer hear when a train approaches her with a speed of 30 m/s. The frequency of the train horn is 0.600 kHz and the speed of sound is 340 m/s.
A. 551 Hz B. 600 Hz C. 653 Hz D. 658 Hz
Physics & Space Science
The average temperature of the typical dark dust cloud is about:
A) 0 K. B) 2.73 K. C) 100 K. D) 3,000 K. E) 6,000 K.
Physics & Space Science
To our current knowledge, antimatter does not really exist; it is purely science fiction
Indicate whether the statement is true or false
Physics & Space Science
An exoergic reaction
a. absorbs energy. b. requires a high temperature. c. releases energy. d. occurs only in stars.
Physics & Space Science