Answer:
3m/s
Explanation:
Data obtained from the question include:
Initial speed (s1) = 4 m/s
Final speed (S2) = 7m/s
Change in speed (ΔS) 
ΔS = s2 — s1
ΔS = 7 — 4
ΔS = 3m/s 
Therefore, the change in speed is 3m/s
 
        
             
        
        
        
Mercury expands when it is heated. This process is called thermal expansion.
        
             
        
        
        
Answer:
  a) 1.866 × 10 ⁻¹⁹ J      b)   3.685 × 10⁻¹⁹ J
Explanation:
the constants involved are 
h ( Planck constant) = 6.626 × 10⁻³⁴ m² kg/s
Me of electron = 9.109 × 10 ⁻³¹ kg
speed of light = 3.0 × 10 ⁸ m/s 
a) the Ek ( kinetic energy of the dislodged electron) = 0.5 mu² 
Ek = 0.5 × 9.109 × 10⁻³¹ × ( 6.40 × 10⁵ )² = 1.866 × 10 ⁻¹⁹ J 
b) Φ ( minimum energy needed to dislodge the electron ) can be calculated by this formula 
hv =   Φ + Ek
where Ek = 1.866 × 10 ⁻¹⁹ J 
v ( threshold frequency ) = c / λ where c is the speed of light and λ is the wavelength of light = 358.1 nm = 3.581 × 10⁻⁷ m 
v = ( 3.0 × 10 ⁸ m/s ) / (3.581 × 10⁻⁷ m ) = 8.378 × 10¹⁴ s⁻¹
hv = 6.626 × 10⁻³⁴ m² kg/s ×  8.378 × 10¹⁴ s⁻¹ = 5.551 × 10⁻¹⁹ J
5.551 × 10⁻¹⁹ J = 1.866 × 10 ⁻¹⁹ J + Φ
Φ = 5.551 × 10⁻¹⁹ J - 1.866 × 10 ⁻¹⁹ J = 3.685 × 10⁻¹⁹ J
 
        
             
        
        
        
False. Carbon is definitely one of the 92 naturally occurring elements within the periodic table.