Work function = hf0, where f is the frequency and h is the plank's constant,
but, f = c/λ , where c is the speed of light 2.998 ×10^8 m/s, and λ is the wavelength (290 nm) or 2.9 ×10^-7 M
Thus, f = (2.998 ×10^8)/(2.9×10^-7)
= 1.034 ×10^15 Hz
Therefore, Work function = (1.034×10^15)×(6.626 ×10^-34)
= 6.8513 × 10^-19 Joules
But, 1 mole = 6.022 ×10^23 particles
Therefore, 6.8513 ×10^-19 × 6.022×10^23
= 41.259 ×10^4 J/mol
but, 1 kJ = 1000 J
Therefore; 4.1259 ×10^2 kJ/mol
1. The answer is D: Tundra- taiga- temperate forest- rainforest
2. The answer is A: Climate
The answer would be a and d
<u> </u> <span><span> No. Neutron stars are the remnants of very large stars that have supernova'd. Anything below 1.44 solar masses becomes a dwarf, anything above 5 solar masses becomes a black hole. Everything in between becomes a neutron star (or quark star, but it's not proven).</span>
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Answer: The focus is the place inside Earth's crust where an earthquake originates. The point on the Earth's surface directly above the focus is the epicenter. The epicenter is the point on the surface above the focus, the place on the surface that would receive the most intense vibrations.
Explanation: Hope it helps <3