Create a short list of luminous efficacies ηl for incandescent, halogen, compact fluorescent, and led-based light bulbs available at your local hardware or drug store.

At 12 noon, the count in a bacteria culture was 400; at 4: 00 pm the count was 1200 let p(t) denote the bacteria cou population growth law. find: (a) an expression for the bacteria count at any time t (b) the bacteria count at 10 am. (c) the time required for the bacteria count to reach 1800.