(i) Clouds appear white. (ii) Sky appears blue.
(i) Name the system which enables us to locate
underwater objects by transmitting ultrasonic
waves and detecting the reflecting impulse. [3]
(ii) What are acoustically measurable quantities
related to pitch and loudness ?
(i) When a tuning fork [vibrating] is held close
to ear, one hears a faint hum. The same (vibrating
tuning fork] is held such that its stem is in contact
zuith the table surface then one hears a loud sound

Explain what makes a passenger in a turning car slide toward the door. critical thinking

Suppose that recording station n is located 200 km north of the epicenter of an earthquake, and recording station s is located 100 km south of the epicenter of the same earthquake. which of the following statements would be true?

Antireflective coatings on solar cells are often made by applying a thin film of silicon nitride (sinx), which has an index of refractive of 1.2, on the top of the silicon solar cell, which has a refractive index of about 3.5. however, the sun emits radiation of various wavelengths which the solar cell absorbs, and the antireflective coating can only absolutely minimize the reflection of one of these wavelengths. the coating thickness is chosen to reduce the reflection of green/yellow light (e = 2.2 ev), which is the most intense color in the solar spectrum (shown below). which of the following coatings would minimize reflection of green/yellow light? the answer is 820 nm how? what is the angular width of the central maximum of an electron traveling at 2 x 108 m/s going through a single slit of width 1 mm.