He work function of a certain metal is 1.90 ev. what is the longest wavelength of light that can cause photoelectron emission from this metal? (1 ev = 1.60 × 10-19 j, c = 3.00 × 108 m/s, h = 6.626 × 10-34 j ∙ s)

1. a camcorder has a power rating of 19 watts. if the output voltage from its battery is 7 volts, what current does it use?answer units 2. a 1.5m wire carries a 6 a current when a potential difference of 57 v is applied. what is the resistance of the wire? your

Acar travels in reverse. it covers 150 meters in 12 seconds what is the velocity of the car what is the speed of the car

1. when conducting a test on what kind of music increases the growth of plants, all of the following would fail to meet to fair test standard except (1 point) using different kinds of plants. giving some plants more water than others. exposing the plants to different types of music. using nutrient-rich soil for one and lesser soil for others. 2. engineering uses scientific thinking to solve real-world problems. (1 point) true false 3. what does it mean to test a hypothesis? (1 point) pass a quiz on other scientists’ results analyze only the results from scientific sources not make assumptions about how an experiment will turn out see if the results of an experiment are what the scientist predicted