The maximum wavelength of light required to eject an electron from zinc is 270nm. Calculate the threshold frequency of zinc.

A monochromatic beam of light has a frequency of 7.69 * 10^14 hertz. What is the energy of a photon of this light? (1) 2.59 * 10^-40 J (3) 5.10 * 10^-19 J (2) 6.92 * 10^-31 J (4) 3.90 * 10^-7 J

In one day, a 75 kg mountain climber ascends from the 1480 m level on a vertical cliff to the top at 2400 m. the next day, she descends from the top to the base of the cliff, which is at an elevation of 1260 m.

What potential difference is needed to stop an electron that has an initial velocity v=6.0

Special relativity can be used to study an object in which frame of reference? A. A frame of reference that is moving at a constant velocity B. A frame of reference that is speeding up C. A frame of reference that is moving in a circle D.

Design an experiment to test the water temperature increases the solubility in water also increses

A battleship simultaneously fires two shells toward two identical enemy ships. One shell hits ship A, which is close by, and the other hits ship B, which is farther away. The two shells are fired at the same speed.

A horse canters away from its trainer in a straight line, moving 37 m away in 9.1 s. It then turns abruptly and gallops halfway back in 1.8 s. Calculate its average speed for the entire trip. Express your answer using two significant figures.

An early submersible craft for deep-sea exploration was raised and lowered by a cable from a ship. When the craft was stationary, the tension in the cable was 7000 N {/rm N}.

What are the components of earths life support system

A car is moving with a velocity (3.0 m/s) € x ˆ + (1.0 m/s) € y ˆ and 3.0 seconds later its velocity is (6.0 m/s) € x ˆ - (3.0 m/s) € y ˆ. What is the direction of the average acceleration of the car?