A 45.0-kg sample of ice is at 0.00° C. How much thermal energy is needed to melt it? For water LF = 334,000 J/kg and LV = 2.256 × 106 J/kg
A) 1.50 × 104 kJ
B) 4.10 × 106 kJ
C) 0.00 kJ
D) 1.02 × 105 kJ
A
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Photoelectric Effect Using Stopping Potential: When light of wavelength 350 nm is incident on a metal surface, the stopping potential of the photoelectrons is 0.500 V. What is the threshold (cutoff) frequency of this metal? (c = 3.00 × 108 m/s, h = 6.626 × 10-34 J ? s, 1 eV = 1.60 × 10-19 J)
A. 3.47 × 1014 Hz B. 3.74 × 1014 Hz C. 4.73 × 1014 Hz D. 7.36 × 1014 Hz
How do caves and caverns form in limestone?
What will be an ideal response?
The three common phases of matter on Earth are ________, ___________, and _______
Fill in the blank(s) with correct word
When an unstable nucleus decays by emitting an alpha particle, the atomic number Z of the nucleus
A) increases by 4. B) increases by 2. C) decreases by 2. D) decreases by 4. E) remains unchanged.