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What is the height of the shadow when the distance from the object to the screen is 60 cm ............................?
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How can you calculate height of a pyramid by measuring the length of its shadow?
By means of trigonometry if you know the angle of elevation or by comparing it with a nearby object if you know its height and shadow length.
How do you use shadow method to estimate height or distance?
Measure height and shadow af a smaller object --- call these h1 and s1 measure the shadow of something larger like a tree. call this s2 its height is the unknown call it h2 use a proportion to solve the problem h1/s1 = h2/s2 substitute in the measured amounts, rearrange the equation (proportion) and find the answer.
How long in feet would the shadow be for an object which is 20.7 feet tall?
The length of the shadow depends not only on the height of the object, but also on how high the Sun is in the sky.
At 11 am on January 13 If the length of the shadow is 2 m and 44 cm what is the Suns zenith angle?
The angle of the sun can be worked out through trigonometry, but first you will need the height of the object that is causing the shadow, since a taller object will make a longer shadow. Tan a = H/2.44 Where a is the angle and H is the height of the object. And the date is not relevant.
What will be the height of the shadow cast by a person standing near a 20 ft light post.The height of the person is 6 ftThe distance between man and pole is 10 ft?
It is zero: 0cm; 0mm A shadow has no height: length yes, but height no
What factors affect the size of a shadow formed on a screen?
The size of the shadows formed changes if the distance between the object and the screen is also changed. If there is an increase in the distance between the screen and the object, the size of the shadow also increases.
The closer the light source the shadow is what?
The closer the light source the larger is the shadow. You can understand this effect using the paraxial aproximation of light theory. If you draw lines from the light source to the edges of an object, there is an angle (call it alpha) between the these lines and the orthonormal vector to the object. The shorter the distance between the light and the object, the higher is alpha (because the height of the object is always the same): tan(alpha) = (height of the object)/(distance between light and object) Of course the relationship between the height of the shadow and the angle is the same: tan(alpha) = (height of the shadow)/(distance to the wall in which the shadow is proyected) So, the higher the angle alpha (and closer the distance between light and object), the heigher is the shadow.
What is the size of the shadow and the distance of the object from the light source when a shadow is formed?
If you are using a point light source, the shadow's size is the object's size divided by the distance from the light source to the object multiplied by the distance from the light source to the shadow.
When a shadow is formed does the object have to be opaque?
when a shadow is formed there should be an opaque object the picture can be formed on the screen.
What is the height of the shadow when the distance from the light source to object is 24cm?
It depends what angle the light is at, for example the shadow would be longer if the light was looking atr the object from the side (45 degrees) than it would be if looking at it from the top of the object(180 degrees).
Why does an object cast shadow on a screen 7 std science?
When a opaque object is placed between the source of light and the screen light from the source falls on a screen aceept some part which looks the shape of the object the Part of the screen wre high does not fall due to the object is called a shadow
What is the difference between a shadow of an object created by a small light source and the sun?
Shadow from light source always bigger than object but shadow from the sun is the same size as object. Great different is due to the distance of light source. Size of shadow is double at distance x 2 source to object. Shadow is always bigger than object. You will notice your shadow is bigger in light bulb or stadium spot light but the shadow from sun is the same size as object. This is due to great distance from sun to us (150 million km approximately) the double distance to see our shadow to be double is at 300 million km from the Sun. at merely 10 m or 100 km is almost no distinguishable different in shadow size to the object. We then presume shadow cause from sunlight is equal to the size of the object.
Describe three factors that determine the size of a shadow and explain how each one cam make the shadow larger or smaller?
The height of the object casting the shadow, the height of the sun in the sky, what angle you are at when looking at the shadow.
How can you calculate height of a pyramid by measuring the length of its shadow?
By means of trigonometry if you know the angle of elevation or by comparing it with a nearby object if you know its height and shadow length.
How do you use shadow method to estimate height or distance?
Measure height and shadow af a smaller object --- call these h1 and s1 measure the shadow of something larger like a tree. call this s2 its height is the unknown call it h2 use a proportion to solve the problem h1/s1 = h2/s2 substitute in the measured amounts, rearrange the equation (proportion) and find the answer.
How long in feet would the shadow be for an object which is 20.7 feet tall?
The length of the shadow depends not only on the height of the object, but also on how high the Sun is in the sky.
What is the length of the shadow at midday?
It's determined by the height (angle above the horizon) of the Sun, and the physical height of the object throwing the shadow. The height of the Sun at midday is 90 degrees minus the latitude plus the Sun's declination of the day, which varies by up to ±23.5 degrees through the year. The length of the shadow is the height of the object divided by the tangent of the Sun's height. Example, a 6 ft object at 50 degrees north on June 21: height of the object is 6 ft, divided by tan(90 - 50 + 23.5) so the shadow has a length of 3 ft.
