Which of the following statement is correct for waves?
They must have same nature , means either both of the waves should be longitudinal or both of them should be transverse . Hence , option ( c) is correct .
Which of the following statement is correct both sound and light waves in air are longitudinal?
D : sound waves in air are longitudinal and light waves in air are transverse.
How do the speeds of sound and light waves compare?
Sound waves travel through air at the speed of approximately 1,100 feet per second; light waves travel through air and empty space at a speed of approximately 186,000 miles per second. Sound travels through all substances, but light cannot pass through opaque materials. Frequency affects both sound and light.
Which of the following statement is correct regarding the wavelength of light?
Hence, speed of light in media is directly proportional to wavelength. Since wavelength increases from Violet to Red, Red travels the fastest. option A & D are correct.
Which of the following statement is correct about components of white light?
Answer. All colours of visible light or white light move at the same speed. The difference is in their wavelengths. V
Which of the following statement is correct regarding vacuole?
Correct Answer : B. Vacuoles are essentially enclosed compartments which are filled with water containing inorganic and organic molecules including enzymes in solution, vacuoles might store food or any variety of nutrients a cell might need to survive.
Which one of the following statements about the LDR is correct?
LDR works on principle of photo conductivity. When photons fall on this, electrons get energized and occupy conduction band escaping from valance band. These electrons in conduction band increase conductivity and so current starts flowing.
Do LDR respond to all wavelengths?
9. Do LDR’s respond to all wavelengths of light? Explanation: LDR’s are non linear devices. Their sensitivity varies with the wavelength of light that’s incident on them.
What is the full form of LDR Sensor?
Photoconductivity. Electronic symbol. The symbol for a photoresistor. A photoresistor (also known as a light-dependent resistor, LDR, or photo-conductive cell) is a passive component that decreases resistance with respect to receiving luminosity (light) on the component’s sensitive surface.
How many types of LDR are there?
Light dependent resistors, LDRs or photoresistors fall into one of two types or categories: Intrinsic photoresistors: Intrinsic photoresistors use un-doped semiconductor materials including silicon or germanium.
Is LDR a diode?
(A photo diode and a photocell (LDR) are not the same, a photo-diode is a pn junction semiconductor device that converts light to electricity, whereas a photocell is a passive device, there is no pn junction in this nor it “converts” light to electricity).
What can replace LDR?
phototransistor
What is the range of LDR?
An LDR’s resistance, RLDR can vary from about 100Ω in the sun light, to over 10MΩ in absolute darkness with this variation of resistance being converted into a voltage variation at VOUT as shown. One simple use of a Light Dependent Resistor, is as a light sensitive switch as shown below.
Is LDR a photodetector?
LDR is the most commonly used photo sensor. Photodiode is used in applications that can only do with two values: either on or off. LDR varies the light depending on certain factors. Photodiode has a quicker response time as opposed to LDR which is analog.
What is the difference between photocell and LDR?
Photocells are sensors that allow you to detect light. Theys are are often refered to a CdS cells (they are made of Cadmium-Sulfide), light-dependent resistors (LDR), and photoresistors. Photocells are basically a resistor that changes its resistive value (in ohms Ω) depending on how much.
Can LDR detect infrared?
It can be said that the LDR is not sensitive in that light wavelength range. Different materials have different unique spectral response curves of wavelength versus sensitivity. Extrinsic light dependent resistors are generally designed for longer wavelengths of light, with a tendency towards the infrared (IR).
What is the difference between LDR and IR sensor?
The IR sensors are very effective and give the good coverage. RC- automation will also use the LDR sensor for the exterior night light. It will work as soon as it sense the light and turn off the light. LDR (light dependent resistor) is a light dependent sensor, it detect the light as the retina of a human eye does.
Is Photoresistor a sensor?
A photocell or photoresistor is a sensor that changes its resistance when light shines on it. The resistance generated varies depending on the light striking at his surface. A high intensity of light incident on the surface will cause a lower resistance, whereas a lower intensity of light will cause higher resistance.
Is a temperature sensor analog or digital?
Temperature sensors are widely available as both digital and analog sensors. Typically used analog temperature sensors are thermistors. There are different types of thermistors that are used for different applications. Thermistor is a thermally sensitive resistor that is used for detecting changes in temperature.