A photocell is any of a wide range of sensors that react based on the presence of light or electromagnetic energy. They can be found in many different forms, from solar panels that use light to generate electricity, to photoresistors, which shift in resistance based on how much light is present.
Bond prices and yields are like a seesaw: when bond yields go up, prices go down, and when bond yields go down, prices go up. In other words, a move in the 10-year Treasury yield from 2.2% to 2.6% indicates negative market conditions, while a move from 2.6% to 2.2% indicates positive market performance.
As a bond's price increases, its yield to maturity falls. For example, if you purchased a bond with a par (face) value of $100, and a 10 percent annual coupon rate, its yield would be the coupon rate divided by the par value (10/100 = 0.10), or 10 percent.If the bond price fell to $90, the yield would become (10/90 = 0.11) or 11 percent.t's important to understand that bonds and interest rates have an inverse relationship, meaning that when interest rates go up, existing bond prices go down, and when interest rates are low, bond prices are high.